Ha. I actually hired a private investigator in Pattaya a couple of years ago. Well, I hired two different investigators. The first team that was sent out were very proficient, but they ended up following around the wrong lady. And I only found this out 3 days later when I received another request for payment, after which I received their report. After that I decided to use a different agency and tried this one instead https://pattayapi.com/ who did a decent job and were in touch with me the whole way through.
Yes, she was cheating on me and I saw her drive her little scoopy bike to the customer's hotel after changing into high heels and a black dress. Fully understand people saying it's a waste of money, but when the only piece of information you're getting is "I GO SALON WITH MY FRIEND NOW OK. YOU NOT BELIEVE UP TO YOU OK", it was pretty satisfying to catch her red handed to be honest. Sometimes you need that to make a big decision.