VODACOM DOES A MIGRATION ON MY ACCOUNT WITHOUT AUTHORISATION

I received an sms telling me that my migration of my account was successful, however I NEVER did a migration and i DIDNT authorise a migration!!!! When I called the Customer careline I was told that the current package I was on is no longer available and that I had to go to another package. I explained that I didn't want any of the other packages because they were all higher than what I was paying!!!! I was told that I had to do that because if I cancelled I would be penalised!!! Why am I to suffer because Vodacom decided to discoutinue the package!!!!!!! This is not on!!!!!