Managers stole from me and used my card without me

I went to the store to return a game it's wrong one. I simply wanted to exchange it for another one. The cashier called Martiwa who said she will not do it as the game was discounted wrong I asked her if it was my fault and she must return it for the price I paid she refused and was very very rude so I asked for her managers number or to speak to and she told me she was store manager and will not do it. She then called the store and did it after me making a complaint. I had taken out my gift card it was purchased with because at one stage she said the discount meant I never paid for the game. With no apology I proved her wrong and she exchanged the game. She did a balance query on my card gave me the paper and squashed and threw my new receipt in the bin and I left. I went to Edgar's to do another balance check to make sure my money was in and left. Sunday I went to purchase something with the card and it had no money said\transferred"I called cna four ways spoke to victor relayed what happened and he said martiwa did it and will call me tomorrow. Could not explain where's the money and has not replaced it. She did it with me not being present and is now avoiding me. Refuses talk"""