Cancelled MTN contract.

I cancelled my MTN contract on the 23rd of August 2020, yet I am still being billed . I then called in in October to query this and was told I didn't completely cancel the contract. The lady assured me she cancelled it "completely " then. I received an email from MTN this morning with my November statement. So I will continue paying by the looks of it. This is such bad service once again from MTN. I will NEVER take out a contract with them again.