False advertising by Travelstar on their car rental

I will recommend nobody ever use travelstar (cartrawler) to book a vehicle. I did that last year. When I booked the mileage on the dropped down menu indicated 200km per day (it was changed since my complaint), but when I received the contract they unilaterally changed it to 100km per day. I think it is false advertising and they refuse to reimburse me the money I had to pay for the extra km's I had to travel. Please DO NOT BOOK YOUR VEHICLE ON THIS WEBSITE.