Cannot get a refund for goods returned

I returned goods to Homechoice on 21st September and emailed them the postage slip & receipt, and providing my bank details. They phoned me 3 times to say goods had been received & did I want to buy something else. When I said no, they confirmed a refund would be processed. Also received 3 emails (in response to my queries) saying refund was being processed. This morning I received an email from Homechoice saying refund couldn't be processed until proof of payment was sent! I have emailed all the paperwork AGAIN, but I'm getting sick and tired of this. I WANT MY REFUND IMMEDIATELY it is almost R4,000.00 they owe me, and almost 2 months gone by with no payment into my account. I will NEVER order from Homechoice again, that's for sure.