Worse service ever received, being ****** for over 1 year

I had a contract with them 24 months came to an end I did not agree to any renewal cancelled for any further services, been told for months and months on end buy customer care consultants that they will escalate this matter to their accounts department but nothing was ever done everytime I speak to a new person I have to re explain myself!!!! I have stopped using the service in 2020!!!!!!! I have moved to America which means I did not even use the SIM card, cellphone number or data / airtime yet I am still being billed for every cent!!!!! Complete utter *******!!!!! I have tried emailing I have tried calling it’s been over a year and they are still charging me!!!!! The next step is social media and legal because is utter and complete theft!!