I've received a letter from Monarch, a debit collection agency, stating that they are pursuing me for a debit of £12 (yes £12!!!) on behalf of an old Talk Talk mobile account I had.
I haven't used the mobile number or sim for at least three years.
The sim came free when I joined TT for one of their broadband, TV and phone packages about 6 years ago.
I contacted Talk Talk in December by phone and they said that the monthly charge I was liable for had been introduced from July 2017. Unfortunately they had my old email address and they sent notification to that old emai