********** service affecting cred score

I took out a contract almost a year ago with probability of settling, debit app**** for but was never debited,

I took a knock on my credit score due to this,granted account sold to debt collector and that was paid once off at R1719.00.

3 months down the line MTN has now sold the same account again to Nimble for an amount of R383 affecting my score again due to incompetence.

Please contact me with an explanation as to what it is that I settled in December and what I still need to settle and make sure it makes sense as this is ********** service you rendering considering that the SIM card is disabled even.