Chris l have had many problems with mae sai immigration this year !! Paying for three Visa extensions this year alone when all l wanted was to renew my 1 year Visa..they even made me cross the border to lose my Visa which complicated things further ..be very careful Chris l payed for a one day overstay then recieved a threatening phone call from them 2 weeks later saying that they never received payment as it is not in their system and if we can't find any proof of payment within the next 15 minutes they will send immigration police to my house and kick me out of the country for 5 years..luckily we found proof of payment..and l just picked up my Visa yesterday..will talk in private if you have any queries or see you down the street Haha p.s get a receipt asap