Telkom is out there to **** the customers ( Fibre contract)

Telkom is out there to reap us off with their Fibre line. I signed up for the 24 months Fibre contract sometime last year and the contract was R450 when I signed and a month later it was increased to R500. And 6 months later am now expect to pay R550. Apparently this was one of the terms of the contract that they can do price increases when they feel like and no one has explained this to me when I signed up,am worried now that by the time this contract finish I could be paying R1000 monthly for a R450 contract.