I read that Pattaya had the most lenient immigration office. I also read that once you use an agent you will be obliged ton continue with one. I went to Pattaya Chonburi office, had to double back to get a photo, but paid 2000 baht to extend my tourist visa and it took 3 visits in 5 hours I started at 8:30 AM to 10:30 then back after they processed at 1:00 PM then done by 2;00 PM.
yeah it should be easily extended. I mean, I thought I read through the Thailand Pass descriptions, succeeded in complying with its requirements, but I somehow came away with the impression- I thought I read - that the pass granted 60 days in Thailand. Apparently that was not an accurate reading on my part.