Another poor service from Vodacom

I bought a contract phone with Vodacom in 2018 May, I paid it off in September 2020 then phoned them to cancel the contract and I also stated that I do not need an upgrade because wow their service is appalling. They promised that someone will contact me and to date, no one phoned me. So a few days back I phoned to confirm if my account has been canceled, but guess what, the contract is not canceled and now it is in arrears. I hate Vodacom with passion!