TELKOM ******* !

I took out fibre with Telkom in January and signed a contract for R399.00 X 24 months. This month my debit order and invoice is increased by R50.00. I call their call Centre and get told that there is nothing they can do about it. HOW CAN TELKOM JUST CHANGE A DEBIT ORDER AGAINST A FIXED CONTRACT SIGNED WITH THEM WITHOUT MY CONSENT