Paid up letter

I canceled my account in August and after a month vodacom kept on stating that my account was in errors. I aggred to pay that amount as my credit score is getting affected for the past 8 weeks I have been asking for 1 number that is missing on my account number as the bank says the reference is incorrect,until last week I was assisted and managed to make the payment as the amount was now disconnected. Now I am receiving the sms's again stating that my account is in errors, can you please cancel my account as I paid what I was advised to pay. You offered me a discount buy keep on saying that I owe you. You are tarnishing my name. Cancel this account and send me a paid up letter