Pathetic service by Vodacom

Vodacom just forced me to change my contract from R356 per month to R499 per month. I logged a query and he final result was the agent telling me that Management made an executive decision to change my contract. They can do it under some sub clause in the contract that I signed 14 years ago when I joined them. Only choice I have is to terminate my contract with them, as stated by the agent that handled my query. Wonderful !!!