Vodacom refuses to cancel contract after full term

My wife has a contract with vodacom for 10 years and recently the service and network is terrible... So her end of term was 1 October 2020 and she was told to call cancellations on 1 September 2020 which is the 1 month notice to cancel the contract. We followed that process and her contract was not canceled... We called again to get it canceled and they advised that it will be canceled 1 November 2020 which obviously meant another debit order going off. We reluctantly agreed but come 1 November, the contract is still not canceled. We went into the store and they cannot help, we called cancelations numerous times and they saying that it now has to be escalated but the supervisors who can approve the cancelation is very busy so they not sure when he will read and approve the mail. Is this how desperate vodacom is for customers.. We want the contract canceled and it's our right to cancel after end of contract term. Please assist or we will have to take it up legally