Unsatisfactory treatment by a negligent Staffer

I would like to express how unpleased I am of a service I received at Baby Boom, The Groove Mall.On the 16th of September 2020, I bought a baby Stroller/Jogger along with a list of other things. Around 5PM or 6PM that evening I got a call from Dan Mahlauri who told me that they had sold me the Stroller at a price of a Walking ring. I told him I'd come and settle the balance the following day after checking my receipt.The next day, after I had received a call and a WatsApp message from Dan, I told him I had gotten a warning from my car that brake pads were finished and asked what were the other alternatives around the stroller issue to wish he indicated that I should return it and they would give me the R700 I had already paid back and in cash. I had no problem with this but was at work and advised that he comes pick it up at my place because I was not going to utilize my resources and drive to the Mall when I had no intention to, especially after feeling that I was being harassed for payment for his or their negligence at the store and I had no idea initially that I was sold the Jogger at a lesser price. On the day he was supposed to collect the Jogger, he told me he was feeling bad about taking the Jogger back and would rather explain to his manager and give me a layby slip then I'd settle the amount when I had the money to. I told him that was okay if I do not settle it on month end, then I will when I get paid on the 15th. He agreed. He sent me a layby slip via WatsApp and that was the last we communicated. After I replaced my brakepads and being morally groomed, I told him I had no money left as I had to pay and could not even replace all my brakepads so the agreement will stand (I had intentions to settle it earlier). Today, again, Dan reminds me of payment and I tell him I couldn't because the father of my child couldn't and would stick to the agreement of paying on the 15th on my salary date. Annoyed as I was with all this I decided to then utilize a credit card that I had no intentions to due to personal reasons and pay this money (R800) and ask him how do I pay it, he does not send me the stores account but his personal banking details. I tell if I transfer this money I need a slip that confirms payment so that this matter is closed and settled and he is not telling me I will only get the slip when the money reflects in his account. I have tried so hard to be understanding and making sure that this mistake gets fixed but Dan is treating me like a ********. If he is not harassing me on WatsApp he is refusing now to give me a slip. It's like I went to the store and stole the Jogger and now have been caught out and being done a favour for being given an option to pay or face the consequences. I honestly do not like this kind of treatment. Yes I had budgeted for the Jogger and used my money as I pleased after that and cannot be held at gunpoint for their mistake let alone being treated like a ******** when I have been soo cooperative and making sure that nobody looses their job because of this. I am very unhappy about this I don't even know if this amount will even be recorded as paid or what. Please intervene and assist with this