Searching " นักสืบเอกชนพัทยา " (private investigator Pattaya) I find several links Bangkok and Pattaya.
If there are ever any questions you need resolved /looked into while you are away -
I am sure it's far cheaper in Thailand to have any matter looked into.
This one might keep friends honest if you need one.
Easily messaged from Facebook:
https://th-th.facebook.com/%E0%B8%99...0750606063616/