Contract cancellation never happened

Vodacom is by far the worst service provider ever! Quick to take your money but when it comes to canceling a contract they drag it out so you could end up paying more. My contract with Vodacom ended on the 05 September 2020, called cancelations and spoke to a lady named Chavonne- she assured me that she processed the cancellation and that my numbers will be converted to pre paid and will send me a cancellation letter which I requested. 5 days later on the 10th of September I do a follow up call because no letter was sent to me the second lady I spoke to said she will email Chavonne for the letter. Today is the 14th I called back because upgrades called me to tell me I’m due for an upgrade and I said I cancelled my contract I then decided to call cancellations again and spoke to a guy who informed me that my contract is not cancelled Vodacom you suck ***** as a provider and I hope that you close down because you can’t even provide a proper service. If my contract is not cancelled by month end I’m taking this further and suggest to everyone I know not to join with Vodacom ever!