Contract subscription

Vodacom is a ****, they changed my subscriptions and when i ask them the lady by the name of Edgar said unfortunately there is nothing they can do about it, and i also cannot do anything about it, i have been with vodacom for more than 20yrs and this is the second time they do this to me so i have had enough and i need something to be done, i am really not happy with their service, the first time i let it slide and just thought it was a mistake but now i see that it is what they do to their customers, they are very rude and not helpful. Subscriptions cannot just go up with R110 before a year of the contract, they cant explain to me why and how all she said was there is nothing they can do and that's how it is.