Product: Debt collection

In XXXX, my husband discovered there was fraudulent activity going on in his credit. He sought out a police report, talked to FTC, filed an affidavit and hired XXXX XXXX to help clear it up. This is still in the works. XXXX of the fraudulent marks was from a company in the state we live in ( WA ). Most of the others were from all around the country. XXXX XXXX reached out to this company and gave them our updated address in early XXXX. We just received our first letter in the mail TODAY XXXX/XXXX/XXXX. Once received, we immediately called the creditor to find out what it was we owed, which was an outstanding debt from XXXX XXXX from XXXX which was my husband, however, we had never received anything in the mail until now and as far as he knew, everything had been paid because they would n't let him off of his probation until it was. We have lived at our current address since XXXX of XXXX. Before that, we lived only a couple miles away in a house together with a friend. I moved in, in XXXX of XXXX, but they both had been there for many years. Today though when we talked to the creditor, they said they have sent multiple letters and called multiple times but my husband has not received XXXX call and we have not received any letters. We open everything before we dispose of it, so this is not something that would have slipped by, especially multiple times. They informed us that they just changed the address XXXX days ago to our current XXXX but could not tell us where they have been sending the others or what number they were calling. The fraudulent activity also seemed to have started back in XXXX - the XXXX thing being a XXXX credit card out of XXXX MI, which we did n't even hear about until years later when a creditor called about that. We got that cleared though and thought we were good to go, until pulling up his credit report this year and seeing all the other inquiries and debt under his name from all over the country. Thats when we decided to seek help. 
I have extremely good credit, and his was good before the fraud, so we are not XXXX to let an owed debt go by. My complaint is that they either have n't sent anything or called, or they had the complete wrong information and did n't take the time to seek the correct information to get the debt resolved. It took XXXX XXXX reaching out to them to update the contact information. It has been five years past now since he was in court and over XXXX years since being off probation ( which again, he was sentenced to be on probation until all fees were paid ) and he completed that in the fall of XXXX. Had we of known there was debt back then, that would have been paid a long time ago. Its been XXXX years and they just now sent us a letter. How in Gods green earth is that fair or even legal? What made matters worse is the lady we talked to was extremely rude and kept saying " this is all he says, she says, '' but again they ca n't provide proof that they have tried contacting us via the correct contact information. They ca n't prove it, because they have n't! If their job is to resolve debt, then they should be able to track down the right information to get a hold of someone, rather than letting interest take over what was initially a small amount, allowing it to turn into a much larger amount with penalties. Please help us so this does n't happen to anyone else.