MTN data contracts

I’m extremely dissatisfied with the service I received from MTN. I had a data contract with them in 2020 which was handed over to a third party (CSS) during Covid-19 lockdown due to failure to pay. In April 2022 I paid all the money that was due on that account and received a paid up letter from CSS, which I submitted to MTN and the account was declared paid and it was even updated on my credit profile as such.

Earlier this year the same account was handed over to another third party(DMC) as if it was never paid in 2022 with a different collection company(CSS). There’s has been a major back and forth between MTN and DMC as they both fail to explain to me how come I’m paying for the same account twice.

This communication has been going on for over 3 months, and since the account was negatively affecting my credit profile I ended up settling the account again.

Therefore I currently have two paid up letters from two third party companies collecting on behalf of MTN.

I have been trying to get a refund for one of them and I need some sort of assurance that in a couple of months the same account won’t be sent to another third party as this has a negative impact on my credit profile.