That stamp is totally NOT correct and your friend ๐๐๐ก๐ก๐ข๐ง ๐๐๐ฎ๐ ๐ต๐ฌ ๐ฑ๐ฎ๐๐ just because they got stamped in wrong ๐
GO to Suvarnabhumi, get the stamp corrected, (shouldn't take you 15 minutes once you get there and go to customer service) they'll send an officer up and correct it..
BUT
keep in mind if they entered on Dec 5th they would have gotten a stamp good until Jan 3rd so they're on overstay now ๐ (or that's how my math worked it out)
Even if you're stamped in wrong you are responsible, so they will be liable for overstay fines (500 baht a day) when they go for the extension.
Go to Suvarnabhumi TODAY, (they're open
****
) and you can get the stamp corrected no problem.