I was promised to be refunded within 48 hours

I did an EFT transfer for Verimark, Im using FNB bank ,so they have RCS Verimark as their public recipient, apparently it was the wrong account,i paid on the 30th March. I sent the proof of payments and my bank details to be refunded and i was told I would be refunded within 48 hours,i still have not received my R3118. Can I please get assistance.