their response to me last week: Thank you for contacting the Embassy of Canada.
Issuing a letter to allow you to stay in the country is not one of the services we provide. What we can provide is an affidavit letter where you need to apply for it in person at the Embassy in Bangkok. It is free of charge. You will need to bring your passport with you when you come to apply. The Embassy can not guarantee if the letter will be accepted. It is up to the Thai Immigration whether they will consider accepting the issued letter or not.
We encourage you to register your stay in Thailand. Please find info. in the following link,
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Sincerely,
Consular Section/ section consulaire
Embassy of Canada to Thailand | Ambassade du Canada en Thaïlande Consular assistance | aide consulaire:
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Passport and Citizenship | Passeport et citoyenneté :
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Telephone | Téléphone : +66 (0) 2646-4300 Facsimile | Télécopieur : +66 (0) 2646-4345 15th Floor, Abdulrahim Place, 990 Rama IV Road, Bangkok,
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, Thailand 15e étage, Place Abdulrahim, 990 Rama IV Road, Bangkok,
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, Thaïlande