Car sales

I am not happy with We Buy Cars....I came to the dealership like 3times now looking for a vehicle I can buy. The dealership's responsibility is not very good...Some vehicles already occupied are not labelled as sold at this dealership and when you speak to the salesman..they disappoint you and tell you that the vehicle is taken already....and as a client when you approached it...it was not labelled as an already occupied vehicle...I humbly request this dealership to improve it's working environment