Sometimes works the other way. I was in my local and I came to check the bill. I had two red wines, the bill was for 100 baht and I knew immediately that they had only charged me for one, I told them and they thanked me
This is a grey area. Just did mine through my bank manager (one very accommodating, the other did not want to know) Tessabarn did one for my friend, immigration possibly. Good luck
These people only go to tourist places (thank heavens). That is why I chose to live where you still have all the amenities without the dross you are talking about