RCS ongoing issue not resolved

After realising that I made payment to the wrong account, I quickly contacted the RCS call center and explained the matter. It was quite simple, the account I paid, was never used and therefore doesnt owe any money. I was advised to send proof of payment and details so the amount could be transfered to my account, which I have done for 3 times. Its almost a month now, and I call like everyday to enquire but the issue is still not resolved. It doesnt help that their number is 086/087 because the money I use on airtime would have covered half of my monthly instalment.