Vodacom Account cancelations request paid and ignored

I paid up my account in August 2019 after requesting for a cancelation letter. I made the payment the same day I got the cancelation letter and emailed it threw to the email address as requested. There after I have phone them and emailed them on numerous occasions as they keep sending me statements. I keep getting told that it has been escalated to a manager but the. No one Co tacts me and it doesn't get resolved. Due to the I have a bad credit rating score and I am loaded as a bad payer. Vodacom is very unprofessional they can see that the number has not been used for over a year know and still ignore my calls to get this matter sorted out