A disgruntled customer called police to complain that a prostitute was not as pretty as she claimed when they met in a car park in the dark.
The caller, who has been warned for wasting police time, contacted emergency services saying she had breached Britain's Sale of Goods Act, reported the Telegraph.
Under this law, the purchase needed to be of satisfactory quality and fit for purpose.
A police spokesman said the man called on a Tuesday, about 7.30pm, saying she had made out she was better looking than she really was.
"When he raised this issue with the woman concerned, she allegedly took his car keys, ran away from the car and threw them back at him, prompting him to call police,” the spokesman told the Telegraph.
"An officer in the Solihull contact centre advised the caller that no offences had been committed by the woman and that soliciting for sex was in fact illegal."
"Despite the man refusing to give his details, police have been able to identify him and have sent him a letter warning him about his actions.”
The spokesman said wasting police time carries a maximum sentence of six months imprisonment.