Non-existent Service and Non-existent Signals

I have complained numerous times re the poor signal quality. Most places I go the signal on my data bundle sim card goes to Edge - very frustrating. I am always told all sorts of stories just to get me out of the Cell C store in Somerset Mall. I have used Cell C's website to cancel my contract (which is now two years in use) and they simply just do not get back to me. I have received an auto generated mail that their Retention Dept will contact me within 2 days......but like I expected, nothing is happening. Taking out a Cell C Data Contract for my iPad was one of my biggest mistakes.<br> Very very frustrating to try and get after sales service from Cell C.<br> All I now want is to get this contract cancelled and even a simple task like this seems impossible as they just ignore me and do not come back to me with a reply.<br> I do not know how Cell C can expect to continue doing future business with such a lack of service.<br> After two years nothing has been done to resolve my query re the continuous poor Edge signal I receive.<br> PLEASE assist me to cancel my contract so I can go somewhere else where I will at least receive a service for which I am paying for.