breach of contracts

This network provider doesn't even deserve a one star rating i called to cancel my contract a month before its expiry and they advised i cannot i am trying to cancel my contract and now vodacom has decided to increase my contract amount to almost fouble the amount i am paying for when i call and query this my discount was cancelled firstly whrn you refer to a contract its a signed agreement that i am entiled to pay x amount during the duration of the contract and then according to FAIS when should be advise before hand when an increase is communicated and never was i provided by written confirmation that my premium would increase and these is a break in contract as this is not the amount i agreed on and i would also like to refer to the time vodacom dowbgraded me and charged my triple the amount i want answers and i will not allow vodacom to ***** my money anymore someone must call and sort this nonsense out and I'm still waiting for the refund that should have been given to me for the months they cheated and charged me triple honestly the worst experience and i would never use them again