I like you beatle, they are my favourite group. No I don't live in DFW (I once lived in Dallas a short time though). I live about 90 miles north of Houston in East Texas. I have never been in the industry, but have studied consumer law.
As to the person who paid for call block, this is why I always say do not call a collector from your home phone. (There's no need to pay in most areas, just dial *67 before the number). How do they do it? Okay, say, someone calls you and blocks their number, you can dial *69 (in most areas) and get the number anyway. *69 does not work for "Unknown Call" etc. Some collectors are currently using a system which sends out Verizon numbers which you cannot call back or trace. This is because many people do not answer anonymous caller ID calls.
If you call a collector, do it on a pay phone. Also, if they call your cell phone they are in violation of the fdcpa, because you would be paying for the call.