The Competition Bureau is suing DoorDash, alleging that the company has advertised misleading prices and discounts in Canada.

Canada’s antitrust watchdog announced on Monday that it is taking legal action against DoorDash Inc. and its subsidiary, DoorDash Technologies Canada Inc., for marketing their online food delivery service at a lower price than what consumers ultimately pay.

An investigation by the Bureau found that DoorDash customers in Canada were unable to buy food and other items at the advertised price on the company’s websites and mobile apps due to the addition of mandatory checkout fees, a practice commonly known as drip pricing.