My visa that I used an agency to obtain expires in August. At the time of applying I was told it was a Non-O business visa, but nowhere in my passport do I see those words - just an extension of stay stamp vaild till August. My question, is it possible to simply depart Thailand and return on a visa exemption without canceling the current visa? If so, are there any consequences for not officially canceling beforehand at immigration?
Also, a 90-day notification is due about the same time as the visa expires. Do I need to attend to this?