Telkom PLEASE SEND ME MY PAID UP LETTER I NEED TO CLEAR MY CREDIT RECORDS

I cancelled my telkom contract in December last year, yet they were still charging me !!! i finally got the issue resolved from a cancellation perspective but telkom had flagged me at the credit bureaus for not paying( for the period where i was being charged and the service was cancelled).

I have been escalating with telkom for the last 7 months for them to issue the paid up later and nothing.i am past my wits end with this !!! it is ridiculous