Telkom smelcom

Closed my account at telkom in April of 2021. I never received any bills from them prior to the closing. Always got that rediculous mms telling me to submit my email which I did 1000 000 times but it was never succesful. So I always had to go on their site to retrieve my bill. Now after cancelling my subscription I called them in May 2021 to try and find out if I owed anything else which the person at the cancellation department told me I didn't. I thought that settled the matter. Got an SMS today my account is due and its been handed over to VVM...... now my question is Why in this universe would they not call me and ask me if I've received the last final bill that MAGICALLY APPEARED a month and a half after I've cancelled my account?????? I seriouisly hope this doesn't affect my credit score. ... Should I contact someone like the Ombudsman to make sure my credit score wont be affected?