Changing the cost without informing clients: telkom bad service

As many of us already know Telkom has a very bad reputation. My experiences have been mostly negative except perhaps a few times acceptable. My latest gripe with Telkom is that I have 2 prepaid numbers with telkom for a while and had the tariff plan called sim-sonke, which charged about 70 cents per minute. Without any communication they changed the tariff to R3.00 (three rand) per minute. Now that is not right, and I feel that it is downright "*****ed" to do this without informing the clients. "Perhaps they are learning from the ******* officials of the ruling party to do this type of actions. " I sent emails to the customer service and only received an automated response! No further communication.