Users of the shared-bike app Ofo are going to great lengths to get their deposits back. The customers are so frustrated that they’ve taken to showing up at the company’s Beijing offices. 

A line of more than 100 people formed in Ofo’s office lobby and spilling outside of the company’s Beijing headquarters on Monday. So many people joined throughout the day that police arrived to maintain order, Caixin has learned.

Ofo users across China have complained about not receiving refunds even after the company’s maximum wait of 15 days after applying. Users are seeking refunds on the deposits once needed to use the shared bikes, some 99 yuan ($14.30) and some 199 yuan. 

But even the users showing up at the office couldn’t immediately get their money. Instead, they were asked to write down their personal information, including the bank account info, with the promise that they would get the money within three days, local media reported.

Related: Cash-Strapped, Money-Losing Ofo Says It Will Soldier On