Complaint about Capitec Bank unfair treatment

My sister sent me money on Thursday, I am a student I had to buy some stuff where I stay, apparently she received money from someone,this person sent money on a wrong account then he realized later that the money was sent to a wrong account, then he reported it. What is hurtful is that they closed my account also instead of closing my sister's account (receiver) while they are still under investigation. I've been calling the branch and they said they will fix it and I've been waiting to hear from them. I can't buy anything, food, toiletries, nothing. I feel like am being treated unfairly by this bank.please help me call them and get help immediately