Refusing to refund my money

I made an eft to finchoice by mistake instead of homechoice which is their sister company. They couldnt wire the money to homechoice and promised to refund me on the 7th of September so I can pay homechoice. Sent an sms to say issue resolved but I never got any money in my account. I phoned them on friday the 11th they asked proof of payment even when they could see that my account was overpaid i ssnt the proof on the 12th and waited, today is the 18th and I still dont have the money and nobody phones me when I phone the lady says she is going to escalate my issue yet again I have to wait for 3 to 5days.Theres nithing she can do and she doesnt have a supervisor, the nerve. These people are *********. Its almost a month they just keeping my money knowing its not theirs. I am utterly disdapointed.