Terminate Monthly contract/debit order and mobile number

I have tried to cancel my monthly contract by emailing customer care in March 2023. This has still not been done, umpteen emails later I am now threatened with ITC for not paying my account. I am no longer employed and am no longer in the country honestly I don't know what else to do I cannot phone as I no longer use my phone since March as I terminated my monthly contract effective 31/03/2023. Upon calling vodacom today I receive an email that I am now on prepaid and that they will bill me until month end. I don't want prepaid, I don't want my mobile number, I don't want my contract. I want everything to end as requested 31/03/2023 Which part of I don't have a job or Please terminate my contract as at March 2023 don't they understand please help I need to get this resolved as no one is prepared to help me with a forwarding email address of a Manager/Supervisor or complaints ombudsman. I always have a clear credit record and do not want to tarnish this due to their staff not doing their job. I have far too many reference numbers to quote but can be supp**** at any stage