I would expect that they will continue to write to your address. You could just send the letters back marked ' addressee not known or resident'. After 6 years they cannot enforce the debt but this does not stop these companies writing.
You should check your latest credit reports, just to make sure. Experian offer a free trial for 30 days, but you have to wait 7 days for the pin no. to be sent to you.
Reading between the lines, are you saying that the letter was in your maiden or previously known name. If so your credit record may well be noted.
Huckster