What should I do if my DTV entry stamp in Thailand is incorrect?

The user discovered that their Destination Thailand Visa (DTV) entry was incorrectly stamped for only 5 months instead of the expected 180 days. They are currently far from the land border where they entered and are uncertain whether to seek correction at a nearby immigration office. Comments highlight that correcting entry stamps is more feasible for air entries than land entries, and they may not assist with corrections in this case. Additionally, mistakes in date calculations and the user's responsibilities regarding their stamps are discussed.