Terrible customer service!!

I've been a loyal to Vodacom since 2016, I just received the worst service ever. I canceled my Vodacom plan in December 2021 its April and I'm still paying for services that Im not receiving because I'm avoiding my cellphone service being barred. In February I did a follow up call on the cancelation and only then I received confirmation of cancelation. It's April and I'm still being billed for the same service.. Today I sent an email and I was told my account is in arrears which still doesn't make sense because I know my account is up to date.. I had a better offer from another service provider but I was convinced by one of the agents to stay with them as they had a similar offer. No one seems to give me a valid explanation as to why my cancelation can't be processed!! I'm very disappointed, your service is shockingly pathetic. You are too quick to take people hard earned cash but can't provide the bare minimum service!! Please cancel my contract and refund me for the months I've been paying for nothing!!!