Poor customer service

Hi. Worst Customer Service ever. I have been trying to cancel my contract with vodacom since Oct 2020 to date nothing has happened. On numerous occasions i have contacted their cancellation dept and spoke to different agents, none of them has adhered to my request. I must have spoken to about 6 agents different dates. Without my consent vodacom has "renewed' my contract for a higher amount and proceeded to debit may bank account. I have written emails of complains multiple times and i have no joy. Why is it so difficult to do such a simple thing? I'm highly angry and frustrated by the incompetence of their stuff that do not listen and do what a client needs. I do not want to continue with their contract. I find this appalling to say the least.