Terrible customer service and sneaky extra charges

This company charged me an extra day when I never took the car for an extra day as waited at airport in front of them while other passengers arrived. They gave me another car not original one as they saw it had a scratch on it. Th car they gave me smelt of sour milk and had a faulty petrol gage which is exceptionally dangerous when driving through remote areas. I told them about it and got a "sorry". Then to charge me an extra day is despicable and once I complained they reimbursed me for half a day??? I will never use Europcar again and neither should you.