Frederick J Hanna Questions and Thoughts

I was served by the Sheriff here in Paulding County just before Christmas. I answered 3 days later to F.J. Hanna and the Paulding Courthouse. I'd asked for debt validation over a year before to Midland Funding (F.J.H. says they represent them) and never got anything back. It was forgotten until the papers were served. In my answer I included the original request for validation. I received a letter from the court that stated that it was being put into mandatory mediation and I'd hear back about that (I haven't yet). I then received a form letter from F.J.H saying they were willing to work out a payment plan, I ignored it. I then received requests for Admissions, Documents, and Interrogatories which I answered by denying everything and requesting my own discovery (basically everything I'd requested on my Validation Request). I sent all my papers Certified Mail. I've not heard back yet and I'm pretty confident that have NOTHING to back up the claims they're making. They haven't mailed me ANYTHING about the alleged account yet. No card agreement, no signed affidavit, nothing! I contacted the credit bureaus and the original creditor isn't listed on my credit report but Midland Funding is. I believe this alleged debt has been sold a few times, every time I fight back it moves on to some one else. It's getting close to the SOL based on the date listed on the Credit Report (which is based on bogus information). I don't remember any thing about this account and refuse to pay based on so little information.
Am I doing everything okay? What are your thoughts? What else should I be doing?

Thanks for any help.