Credit not reflecting on my statements

On the 9th of September I was credited the amount of R1082.92 (exl. VAT) for my data account after emailing the form I had to fill in and sign. I received an email from Yaseem saying that it had been submitted and approved. I received my account today and there is no credit. I looked at my online bill and it reflects the same thing - an amount of R1660.55 due to be billed at the end of the month. You can't say something has been credited when it has not. I emailed Yaseem this afternoon but have as yet received no response. Please sort this out.