RMCS & Cell C

I have been trying to perform a sim swop as I lost my phone a week ago, and when I visited the Cell C store, Carlton Centre, I was told that my cellphone number appears to have an active subscription with RMCS and I was told to call their call centre to get assistance. The most frustrating part is that I previously tried to contact the company in November pleading with them to convert my number to prepaid and to cancel the subscription so that I can port to MTN. Every time I call them, I am being told to wait for 24-48 hours before I can receive assistance.

Is there any other way I could escalate these people for the terrible & ****py service they offering us as customers?