that's just the thing, I don't understand the "double void" stamp thing. One void was on it when I picked it up (to signal the rejection I assume), the other void was stamped in when I arrived in Chiang Mai.
So essentially I came in on a visa exempt.
I've had a couple of back to back visas 3 years ago and one ED Visa 1.5 years ago. This was to be my second year ED for Thai language.
My visa expired last Sunday. I flew out Monday. The immigration officer noticed my overstay, went and spoke to another colleague, came back and let me through without a fine.