If you are in Tak province then Thai immigration in Tak will be able to assist you with extending your tourist visa for another 30 days or extend your marriage visa or Thai retirement visa for 12 months. note the map and contact numbers for the immigration office in Tak.
If you have any questions then you can call or email them on the numbers listed below. Note the opening hours for Thai immigration in Thailand. As always be early as it does become full rather quickly. If you know where the One Stop Customs House is in Tak then Thai immigration is a short walk from there.
Thai Immigration Tak
188 Asia Road, Amphoe Mae Sot, Changwat Tak
Opening Hours: 8:30am-4:30pm Monday to Friday
Service Area: Provinces of Tak