FNB doesnt want to refund me and savanna mall staff is not helpful

I accidentally transferred money into a credit card which apparently the staff said belongs to me and i have never signed up a credit card. i went to fnb in Savanna mall Polokwane and they said it will be refunded in 7days. 7 days nothing. i went to the bank again to find help and the staff at savanna mall wasnt helpful. So i went to fnb in polokwane central on saturday the 15th to get assistance and the bank manager said it will be refunded in 12-48hours working days. Now im being taken from pillar to post to get my money back. I had a horrible experience with FNB, its been 2 weeks since i reported the matter. Can someone please help resolve this matter.