There are many AIS outlets maybe try another bit like trying to open bank accounts. Outlets in larger shopping malls maybe are better, failing that other providers
If you are in Thailand perhaps you can find out for yourself by checking other dealers and websites and so on rather than relying on the info of a friend who maybe has a motive
Exited BKK in August through automatic gates with re entry permit returned October still had to re enter the old way but being over 70 could go through Thai gate with my Thai wife so still got a stamp but avoided long line up