Police in Ann Arbor say they took a call from a man who was upset that the price he agreed to pay for prostitution services had increased unexpectedly.

AnnArbor.com reports police were called to a home late Wednesday on a report of a robbery. Police say the 45-year-old man and a 19-year-old woman he had contacted online agreed on a price, but the man claimed that she upped the cost after taking his money.

Police say the woman was arrested and the man wasn't taken into custody.

According to investigators, the man and woman gave vastly different accounts of what happened. The case is under investigation and prosecutors will determine any possible charges.