Why have I been sent a bill which I reported as a scam letter last month

[Nick25]

Why have I been sent another bill when I don’t owe any money 

[jonsie]

This looks like something you’d need to call O2’s customer service team about – give them a call on 202  or 0344 809 0202

Use the specific Payment management number  0800 902 0217

The opening times are:
Monday to Friday – 8am to 8pm
Saturday – 8am to 6pm
Sunday – 9am to 6pm

[MI5]

@Nick25 

Assuming you reported as fraud?

If so, just to manage your expectations, you will continue to get bills whilst they investigate and if you refuse to pay, the debt will be passed to debt collectors.

Although against all instincts, you are better off paying and getting a refund once all is sorted out.