JC International/Sky debt I don’t recognise?

Good evening.

i hope we are all and enjoying the sunshine!.

I have come home the other today from a letter from JC INTERNATIONAL ACQUISITION LLC

The letter states I owe £78.00 from a previous sky bill from a previous address.

I haven’t been with sky for a minimum of 10 years as this was when I lived at university and I have only just recently purchased my first house and lived with parents.

Anyway. This is the first time I have ever heard of this debt and don’t re call ever hearing anything in regards to this otherwise I would have sorted this prior.

i have searched my credit score and have been on it for the last 3 or 4 years whilst I saved for my house and no missed payments or anything show in regards to this. However, as of today it is showing as a default since January 2021, which makes no sense as I have not been with them for 10+ years?.

I have already messaged them asking for proof of debt (ai helped me write an email) What is the best way to approach my credit score shall I await for a follow up or should I dispute?

Thank you!.