Filthy car, terrible customer service from europcar

Waited for half an hour because the pre-booked baby seat wasn’t fitted. The car itself was disgustingly filthy. Had never been cleaned and the previous occupants had left such a horrible mess. Steering wheel and dashboard screen and buttons were covered in an unknown sticky substance. The car smelled of smoke mixed with fruit juice (presumably previously spilled in the car). There was food all on the floors and under the seats and discarded cigarette butts under the seats. The boot was full of mud and dirt. I contacted Europcar but they never returned my calls or emails. We only hired the car for 24 hours and I was in such a rush I wasn’t able to return the car and ask for an exchange.