"Migration" to a contract without my consent

I was on weekender plus, then my notifications stopped for my voluntary R200 call limit, I was told that their system was off and they will correct this. The problem still exist. I busted my limit and was never notified. They told me it was data usage, Weekender plus is not data, they refunded partially in admittance. Still my notifications did not work. Got bombarded for upgrade. Keep telling them NO NOT INTERESTED. Then I was migrated to new contract without my consent. 22/08/17 between 08:00 and 10:30 lady phones me yet again for data that I use but don’t. I told her about the contract upgrade which they call “migration” she told me to ignore because vodacom will never do that. Guess what I was migrated without my consent. I lost over 200 free minutes, they just feel nothing. Please help. This is a ****