You all go in a van together, they will assist you, from CM prolly go to Mai Sai. I did it with a shop front agent near Mikes Bar old city on Moon Muaeung - may not be there now....
This happened to me way back in 2004. No stamp in passport; I was in Chiang Mai at the time and went to immigration when I discovered it. They fixed it, no problem. They will make corrections for you at immigration Jomtien.
Don't rush into anything come over and do 2 back to back tourist Visas or a 1 year Education visa; that will give you plenty of time to sift thru and plan your options.
Come back from Cambodia and you'll get the Visa Exemption which will get you, if extended, 45+30 days. If that is enuff time for you, you wont need the TR Visa. This is an alternate suggestion for you.
It's weird because the 'smart' government folks can't determine what a real marriage is. Why should a long term married couple not be able to visit the man's home country, why can't the government get it right...?
What a sad fucking world we live in now. A man can't even bring his long term wife back to his home country. Can't the smart folks at immigration figure out who is trafficking and who is a legit couple- who makes these decisions...