Unauthorized upgrade on my lines

Vodacom upgraded my line without my consent. For the past month, I have been trying to cancel both the upgrade subscription and the associated insurance, yet no action has been taken. As a result, I am now unable to take out a new contract because there is an open upgrade on my account that I never requested. Every time I call customer service or visit a store, I receive a different explanation and a new turnaround time, with no resolution. The lack of communication, accountability, and consistency has been extremely frustrating. Once again, I am experiencing poor service from Vodacom. I would appreciate an urgent investigation into this matter, immediate cancellation of the unauthorized upgrade and insurance, and confirmation that my account has been corrected.