I agree with the other answer. You seem to be doing very well and there can be no halm in making complaints to those you have suggested.(posted 8240 days ago)My position is the same in that they say sending a letter to an address where I did not live means they have made contact. I asked for, and got, copies of these letters. There were 9 in all and as far as I am aware they were all returned to sender so why I wonder did they continue to write? These companies cannot simply make threats and say that they have sent a letter so that is fine - proof of posting is NOT proof of receipt. It is up to them to prove that they made 'contact' by way of the original letters. As long as you can prove you did not live there then there should be no problem. Can you get a letter signbed by the person who does live there to dsay they returned the letters?
Anyway - onto another thing. If you look at the posting just down the page about the Guardian and the 6 year rule I feel your case is ideal as it backs up those already going forward and, in my opinion, proves that this situation is very common indeed.
Have a think and let me know what you think - or mail Elaeanor directly.