Thank you for your help

I have also had a letter demanding a payment. Account number and ref number. But no idea who I owe or how much. I tried to phone the number to get the details but they wanted my cc number and it was an automated response thingy so I was no nearer finding out. Then I tried the internet with the same result. So I have sent them an email stating I do not owe anybody any money and consider the letter a [problem]. Hopefully they will now tell me who and what I am supposed to owe. I suspect when my email addy was hacked they used the info to buy something on a buy now pay later style thing. And I get the bill but not the item. Really worried about this as money is so tight. My husband is not well so I have kept quiet.