Cancellation Of Contract

This contract was completed in Oct 2015. The contract amt for 24 months was +-R359pm. Afeter the contract the billing automatically went onto R125pm. Which i was happy with. To my amazement a month later I was billed for R466.50. Upon enquiry i was adv, this is the norm and they have to bill me according to my previous contract. I phoned the call centre and asked for it to be reverted back to the R125pm, and be re-imbursed the diff. I was told that my account will be credited with the diff. BUT!!! once again, I was debited for R483 in Jan 2016. I was insensed by the whole saga and requested my contract to be termintaed immediately. I filled in the cancellation form on the 22/01/2016 and sent it off to cancellations dept. To date, NO ONE has cancelled this contract NOR!!! has anyone phoned or sent me an e-mail advising me when this is going to be cancelled. I received another bill via e-mail, stating R466.50 will be debited on the 29 Feb 2016!! This debit order cannot go through on the 29 Jan 2016 and I would like to be re-imbursed as I didnot auth for Telkom to debit my account with an amount greater than my initial contract amount. Disgusting Service! Call centre no:081 180.