contract problems

I wanted to upgrade my cellphone contract, but was told that I can't have a cheaper contract. I must take out a new one, cancel the old one and then the number will be ported to my old nr. This was on 7/9/2015. Since then I battled to cancel my contract, had to fill in cancellation form twice. My nr. was put on prepaid in Dec, without contacting me. I used the old one to receive calls and new one to make calls. In Jan, my nr was cancelled. Now my nr is back at Cell C , my previous provider(longer than 2 years ago) and I must now sort it out. I phoned numerous times(All calls were recorded and noted), went to the shop etc. everytime I phone the call centre, I have to explain everything AGAIN and are told that someone will phone me. Its been 4 months now, I lost money because people couldn't get hold of me for work. I had to pay for my old contract for two extra months and am stuck with a new nr I don't want. I tried to send an email to telkom to complain, but the web site so user unfriendly, I dont even know if someone read it.