Sorry it is beyond nasty to ask for my card payment details, as I have never given them these, have never had an account with them, all I did was use my email address to try to send a one paragraph document to myself.
Just for info, it has become quite common for even
reputable companies to ask for payment card details as a method of identifying an individual, even if no payment is to be taken from that card.
Personally I usually avoid giving card details (and most other personal information) at all costs - but sometimes it is the only way of making progress with organisations that have their own rules (and laws) they have to comply with.
I feel very badly shaken by how they have behaved. I wouldn't have believed a big company could behave so badly. After Newspaper.com's email yesterday demanding my card payment details before they could do anything they haven't replied to my reply that I only want to be able to delete the account I never created or change the email address that I never gave to them.
There's a risk of sorting this out being more difficult than it needs to be if confusion over what the actual problem is leads to Newspapers.com tech people trying to solve a different problem to the one which exists.
You
do have an account, and you
must have given them your email address, otherwise they couldn't have used it in the way you described earlier.
If you are telling them to delete an account you don't have, linked to an email they shouldn't know, then they are going to get confused as to what you are asking for. Furthermore, saying you didn't give them your email address may make them think someone else has been using it to falsely set up an account, raising questions over who is controling the account and paradoxically increasing their need to get verification of your ID (e.g. by taking card details) before they can do anything.
I'd suggest the best approach is to say you didn't realise that giving them your email address would result in an account being created, and can they please delete the account and all information linked to it. If you check their privacy policy it does seem that is something they can do.