Refund

I paid up and cancelled my contract on 20 April, of which I paid R2400 and a debit of R310 was still made on the same day. I sent the proff of payment on 21 April and got ref no. ***. I called on 22 April to confirm receipt of payment and spoke to Tsholofelo and got ref no. *** and requested for settlement confirmation letter which I received on 30 April when I spoke to Faith with ref no. ***. She confirmed that I did pay more than what I was supposed to and then moved my SIM to a prepaid package. Since then I cannot call the 808 call centre to confirm the extra amount paid and as to when will I receive the credit back into my acc and call centre no. 173 doesn't give the option of speaking to a consultant in order to be assisted by the appropriate department. Can I please get assistance in this regard because even from the credit management email there is no response whatsoever