Pathetic billing service

I renewed my contract in July this year. I previously had a Telkom Mix withBlackberry Mix and changed to a Telkom Mix with a Sony. The new contract price was supposed to be R499. Since then I have beeen paying over R700 pm. I tried to sort out the bill with the call centre, I declared a dispute and I even went into a Telkom store to try and sort out the problem. Telkom changed my contract to an Anytime Plus without my authorisation. The person at the Telkom store agreed that the contract was for R499 and should have been an Evening and Weekender with a Smartplan 100 and a Sony handset.