[quitit]

Some people are bad with their finances and may believe that they had outstanding debt.

Although your suggestion is entirely plausible, shaking the chains is also plausible.

It would at least get me to call the company because the letter is written to suggest that there is outstanding debt.

If this was an error: The proper thing to do is a follow-up letter to apologise for the confusion and confirm that their credit rating is not at risk, until that happens it’s fair to assume the worst of the company.