Sounds like you’re living in Thailand by using these visa exemptions. If you’re using them consecutively, that’s the issue. 2 back to back of these essentially means 6 months, which translates to“living in Thailand.” They do want you to live in Thailand, but there’s a price to pay for that “service”.
You can apply for a 30-day extension on your tourist visa, and an extra 7 days after that. But you probably have enough time to apply for a DTV in a neighboring country, if you act fast.
getting a ‘proper’ tourist visa doesn’t exempt you from getting refused at the border. The only advantage it provides is that it’s holder isn’t restricted to the 2 land border crossings per year.