Contract cancelled but still being charged!!! - Call center agents cutting calls when it connects

I cancelled my contract on 15 Oct 2020 but was stilled charged on 01 Novemeber, I spoke to an agent who said the cancellation was processed and that was the last payment, however, the debit order went off on 01/12/2020 again!!! I have been waiting so long to connect to an agent now only for the phone to finally start ringing and then your agent cuts the call!!! PATHETIC SERVICE FROM VODACOM!!!