New phone,sim cannot be activated but still billed

Contract taken out in May 2015, Phone eventually delivered in June, to date sim cannot be activated, therefore cell number cannot be ported from Cell C - therefore clearly no calls can be made - but nevertheless am billed for the service. Innumerable calls to useless call center, written to client services, threatened - all no progress. Have spoken with call center agents, supervisors, managers - all with empty promises.<br> I hated Cell C's poor coverage, but OMG how stupid I was to change. MTN completely ***********.<br> I so wish I could simply return their phone - am so worried about another two years with such a pathetic organisation.<br> To add insult to injury, this morning on trying to, again, call their call center, I'm now informed by their electronic system that my number is invalid - so can get no further.<br> My genuine advice to anyone out there that is considering switching to MTN - be afraid, be very afraid!