Did I do the correct thing?

Hi, Everyone. Back in January, I received a collection letter from CBCS. I responded back with a letter of validation. I sent it certified mail and they never responded to me. Fast forward to present time... I'm trying to buy a home and due to certain items on my credit report, the loan office called me and we did conference calls with the various creditors that were on my report that I said I had no idea or that I disputed. They were doing this in order to see if I still qualify for my loan. Either way, CBCS still has the collection listed in my credit report and when I called to verify, they did have my name, social and birth date. Problem is, they still couldn't tell me when it actually started since they bought it from Asset Acceptance. They could only tell me how long it's been reported. In my original letter to them, I asked them for proof that the debt is mine and for any contracts that I have signed or agreed to that I would pay this amount and how they came up with the amount it..etc. Well, since they hadn't done anything with it, I emailed the Attorney General for my State with a copy of the letter I sent to them and the tracking number for my certified receipt from the post office. My question is, since they do have some of my information, this still doesn't constitute valid proof does it? And was reporting them to the AG the right thing to do at this moment? Oh, I forgot to mention that in about a year, this debt is to be taken off my credit report anyway, should I just let it ride?

Budmas