At wit's end with Vodacom

Firstly this company doesn't even deserve a star. I've been trying to cancel my contract which I've had for longest time. Firstly When you call the customer care number and select the option to cancel contract, you are given another number to call which has the exact same prompts as the first number you called. Then when you do eventually speak to a consultant, you get interrogated for wanted to cancel. The consultant by the name of Preston, was so rude and had the odesity to ask me if I had pent up anger when I told him his persistent questions about why I want out of the contract were irrelevant. My contract should have ended in December 2024, however I'm still getting billed to date. Now I'm being told my contract will end in April and I cannot even visit a branch to sort this out, but have to put up with rude and arrogant operators who think it's okay to speak any old how to a customer. Must it be so difficult to end contract because you are no longer happy with a service? And the contract just keeps getting renewed without consent from the customer.