what do you not understand? They can take a long long time and they refuse to issue the visa once you leave the country where you requested it, in our case France.
We missed our deadline as well after 5 weeks of waiting. They will not issue after you left the country (even though in our case we would only enter Thailand 2 weeks later).
Not sure where your citizenship is, but not all countries get a visa exempt. If you need visa on arrival you probably were lucky to get the 30 days, it was a special to promote travel, valid until 31st march, after that dat it went back to the usual 15 days.