RCS REFUSE TO REFUND ME

I have never experienced such bad service from a company and given the run around for a refund of such a small amount, The only reason why I will not let it go is because RCS have no right not to refund me because the credit is less than R 30.00 and therefore cannot be processed as a refund. I have been trying to get them to refund my over payment and thought we finally resolved the matter when they emailed advising that I can go into Markro store and request the refund. There was no discussion of the credit going onto my Makro account as I been requesting Makro account to be closed and are held hostage that as long as I want to be refunded my account cannot be closed. On Friday 28/06 I went into MAKRO store as per there instructions and was informed I need to email proof of income and whatever else in order for them to refund the money into my bank account. Why is so difficult to receive my refund when they have my bank account details. Why do i have to pay R30.00 for an another store card when I DON'T WANT TO USE THIS ACCOUNT. I would like to my refund paid out as this have been on going since 20 May 2019. DO NOT CALL ME SEND ME AN EMAIL