It's been a month and no refund as yet

I, by accident paid money into their FNB Public beneficiary account at the ATM at the end of October 2017. I went to FNB who sent them an email requesting the refund, I have since sent various emails and have called about 15 times. I am being sent from pillar to post, promises are being made for the refund to come through, but to date NOTHING. No refund, only empty promises. I have never bought from Justine and NEVER will. I will tell every person I know NOT to deal with them. They are *******, they take money that does not belong to them and they do not refund it!!!