CELL C BAD SERVICE

I paid R2000.00 in advance on the 20th of March as i was told i am due for upgrade and i wanted to take a laptop, When i was called to come and fetch it, the consultant from Newtown Mall told me that I no longer qualify as i had skipped a payment (I normally pay in advance) and i was not Aware. Since then i have been requesting for the refund as i am not eligible for an upgrade, i have been taken from Pillar to post, a guy by the name of Mthokozisi Ngobese has been helpful and though there is hope yet again i have been disappoint because i am not receiving feedback nor am i getting my refund. This is really bad service as no one has contacted me to confirm my account details as to where will the R1930.00 be transferred to. I have been a customer for 8 years with Cell c and this really is a disappointment.