Service cancellation

<p>I have (had) a 5gig data ****le contract with Telkom which I cancelled in June 2016 because the 2 year period was over at the end of July 2016 and I requested this cancellation numerous times since then. The contract was not cancelled and went up from R239.00 per month to R905.00 per month from the 1st of August 2016 (even after I have not used it). They now insist I go to a Telkom brnch to cancell the contract in writing but this makes no sense to me, why can a person take out a contract telephonically but not cancell it the same way?</p>