Very bad service from Vodacom

They called and informed me that they will be migrating my package to the new packages with no additional cost. They also said i will pay less to what i'm currently paying as part of the migration, and confirmed that it's not an upgrade. Now i'm being informed that i have upgraded my account and have been billed 3 times more to what i was previously paying. I requested a call recording for the migrations request which is now taking forever. I called the customer care but i am now being transferred from department to department. One of the consultant informed me that my I'm only due for and upgrade in October 2022. how is it possible that they can upgrade my account anytime without my confirmation.