Game George poor management

What a terrible experience at Garden Route Game George yesterday. I went in to to buy a Office Chair as a gift for somebody's birthday today. Firstly I stood looking at the chairs for over 15 minutes and no body offered any assistance, I then asked the lady at a counter if she could please call someone to assist me, which she did. Someone eventually arrived and assisted me, I told them which Chair I wanted and they said they would fetch me one from the back. 15 minutes later and I was still waiting for the chair to arrive, eventually I asked a second sales assistant to please help me and get me the chair I wanted. Again I waited 15 minutes and no chair or sight of either sales assistants, eventually I bumped into the first assistant who helped me and he told me they did not have stock of the chairs, they only had the display unit left. I then said I would take the display unit. They then could not find the bubble wrap to wrap the chair. I eventually got the chair and went to pay. As I paid, the transaction went through, the till shot open and load shedding kicked In. The till and computer obviously then shut down. I had proof from my banking app that the transaction was approved and went through. The computers then came back online and they could not find the transaction on their computers in order to print my slip. I was then told that I had to repay for the chair as the first transaction would be reversed that evening as load shedding kicked in. I refused to repay for the Chair, as I had proof on my banking statement that the transaction had gone through, I even got the transaction number from my online banker for the transaction and gave it to the store manager. They then told me that I cannot leave the store as I had not paid for the goods. Again, I showed them proof of payment from my online banking app. I was now standing in a store being accused of not paying for something which I had paid for a was being told that I could not leave the store with my goods which I owned as the payment had in fact gone through. The cashier was very helpful during this time, this was not her fault at all. However the manager took no responsibility for the issue being on Games side and not mine. She expected me to either pay again, or leave the goods which I had paid for over night at the store and collect them the next day. Thus not being able to give them as a gift in the morning. She was extremely rude on a few occasions. She refused to see that I had proof that the payment had gone through, it is not my fault that she could not find the proof on her end. This should have been reversed, I should have been asked to please leave my ID and details incase the payment did not reflect in the morning and to please then make payment. This should have beens Games issue, not mine. However Vanessa the manager kept trying to make it my issue and telling me that I cannot leave the store with my goods and that I can get them the next day. Why must it cause and inconvenience for me, when the problem lies on games side? I had all the proof including a transaction number that the payment had gone through. I agreed at all times that should the payment reverse for who knows what reason as I have never had a payment reverse before that I would gladly come back into the store and pay for the chair. However they cannot keep me in store and not allow me to leave with goods that I own and have paid for. I offered to leave a copy of my ID book and all my details or whatever they required. To top it all off after they got confirmation from head office that I can go with the goods, I was told that the next day I would receive the slip for my purchase via email. I was told by Vanessa the manager that she would deal with this at 7am as soon as she got into the store and that I would not have to follow up it would not cause me any form of inconvenience at all. And surprise surprise it is now 16.30 the next day, I have not heard a word from Vanessa, in fact I went out of my way and watsapped her requesting my slip to be emailed to me. My message has been ignored and still no slip has been emailed to me or even a follow up call or message to apologize for the incident and to confirm that the funds in fact had not been reversed. This is extremely poor customer service, the fact that game tried to keep my possesion after I had paid for it and tried to make this all my problem and not there's is pathetic. I expect something to be done regarding this.