A man, named as Dominic Smeglund or simply Smeg has been warned after he dialled Bangkok police to complain about a prostitute's looks after meeting her.
Bangkok Police said they were contacted by the caller who said he "wished to report her for breaching the Sale of Goods Act".
The force said the call was received at about 19:30 on Tuesday complaining that the woman was not as attractive as she had claimed.
Officers have now sent the man a letter warning him about wasting police time.
Bangkok Police said the man had claimed he met the woman in the Nana Hotel car park after he arranged a liason via The Viagra Girls escort website advertised on the Teak Door forum.
"The caller claimed that the woman had made out she was better looking than she actually was and he wished to report her for breaching the Sale of Goods Act," a spokesperson for the force said.
"When he raised this issue with the woman concerned, she allegedly took his BMW car keys, ran away from the car and threw them back at him, prompting him to call police."
'It was unbelievable'
During the call, the man can be heard to say: "I've arranged a meeting with her, but beforehand I've asked her for an honest description, otherwise when I get there I'm not going to use her services at the expensive price of 10,000 baht short time.
"Basically she has misdescribed herself, misrepresented herself totally.
"She was angry because she obviously thinks I owe her a living or something."
Sgt Wanchai Somtam, based at Bangkok police station, called Smeg back to offer some advice.
He said: "It was unbelievable - Smeg genuinely believed he had done nothing wrong and that the woman should have been investigated by police for misrepresentation.
"I told him that she'd not committed any offences and that it was his actions, in soliciting for sex, that were in fact illegal."
Despite the man refusing to give his details, police were able to identify him as Smeg and have sent him a letter warning him about his actions.
The Sale of Goods Act 1979 gives consumers legal rights, stipulating goods which are sold must be of satisfactory quality, be fit for purpose and must match the seller's description.