many times I am surprised that people, once in Thailand, let their "guard" down, not checking anything. So far many people lucky as Immigration not fine in such cases, but guys it is " YOUR PASSPORT, YOUR RESPONSIBILITY".
summed it up nicely. As far as visa issuing is concerned we can not add more. Please make sure you book appointment for apply the visa and book appointment to pick up passport.
they should be denied entry into the premises and barred from applying a visa. Have some good manners and show respect. That's the minimum Thailand can expect from it;s visitors...