Why not just got to the dealer nearest you...probably easier.
I like to have some points confirmed by the actual importer/distributor, having these confirmed in writing helps.
Did you send it in Thai?
If I had to, that itself would be a deal breaker.
Try this - 062 890 2222 from their website... call us link, plus Call Center is 1267.
Spent a long time doing this from the dealer's themselves, they are just a Call Center, servicing many Thai companies, and can only forward on requests.
Try a letter to Morris Garages, Oxford, England. 555
Crossed my mind.
Quite amazed after 604 views, that nobody to date has achieved direct communications with MG Thailand.