Participante anónimo 679 totally not a bribe, agents are legally allowed to do not do the regular queue. It's the same in all countries. There's no obligation to use their services if you don't want.
I just double checked my passport, from all the stamps, only 2 have the until date stamped, and in all the others is handwritten 😱 Didn't realized they used both.
The "problem" is not your DTV, rather your past immigration history, that, it seems, the officer considered suspicious. Now, I think they can see what kind of DTV did you got, because in my case I got it as a remote worker, so it's obvious that what I'm doing is remote job. Did you get it for soft power? medical treatment?