CONTINUING TO DEBIT ACCOUNT THAT SHOULD BE CLOSED

I left South Africa April 2023 and chose not to pay up my contract that was ending in July 2024. I requested to cancel it via email as I could not call from the uk. I had a number of different call centre agents coming back to me either asking for security details or asking me to disable dual calling/stating that they would disable it in order for my contract to be cancelled. In September I was told that everything would be resolved, and end August would be the last payment. However I have been billed again 30 September. Outrageous "SERVICE" and I guess they dont care so long as they can keep debiting for a service that I haven't used in 17 months, and can just increase fees and roll over contracts!