They were served on his attorney of record. Joseph Laurence Jacobsen in Travis County, Texas.
Also, generally, you can't sue an individual by serving a lawyer, even one who has represented him before, unless he is "doing business" and has designated someone to be served.
So, I'm skeptical of your statement, without sourcing.
Also, re an earlier post, a Texas jury found him guilty of the felon-in-possession charge, so it's hard to say that the criminal charge was "trumped-up."
Finally, they don't have to "let you out of jail" to defend yourself, at least to the extent of mailing in a piece of paper saying "I deny everything"
Seriously, this issue has been beaten around the bush for some time, you would think that someone (Smoking gun.com?) could come up with the court file. There should be a copy of the complaint, the return of service (showing how the defendant was served), and the particulars of the default judgment. That would help ground the arguments on both sides in some facts.