Europcar and bad service

Each time my rental car has to go for a service it turns out to be 2weeks of nightmares. First to get the car in as they never have cars available eventhough i contact them in advance and nothing different. Trying to get a car since Wednesday 19oct 2017 and i was promised my chosen car by different people that blame another for not telling them. Each day i waste my time taking off work to drive there with no service or help. Not even the branch manager acknoweges me or talk to me directly she talks through another person next to her and that person needs to speak to me. How did she become a manager thats suppose to give customers service???? So sick and tired of fighting to get their cars serviced but a contract keeps me liable. Pathetic.