Sorry I was wrong when we did ours they said nothing took the money and stamped for 7 more days it’s wasn’t at the end of the 15 days it was in the middle as we were heading to Bangkok.. didn’t read it but they didn’t make out like it was a big issue .. and I asked at the embassy about voa in Myanmar and they set email saying can’t I crossed and there was no visa on arrival desk at mae sot ..