Telkom Mobile is pathetic

I sent an email to the cancellations department on the 07/04/2016 to cancel a contract ending on the 05/05/2016, since i was told i had to give 21 days notice. I have sent numerous (probably like 20) emails to them, I put on a read receipt and my email was deleted without being read. I included *** and they don't understand anything, i was promised by 2 consultants that they would help me but there is no progress. On top of this I took out a new contract in March, they debited R99 from my account and told me that it will be credited on my next invoice, i have received 2 invoices and I have still not received my credit. All correspondence to their customer care has gotten me nothing but frustration. I requested that a manager call me back but I have not heard anything from them.