Frankfurt-Rhine River-Heidelberg-Frankfurt

The engine failed to start twice: The first time was the day after renting the car, in the parking garage of the exhibition hall, it would not start. I called, but both breakdown numbers on the car key were unreachable and automatically disconnected! I tried the phone number on the rental platform, and after several transfers and explaining the situation, we waited for about an hour for assistance. During this time, I kept trying to start the car. Shortly after the phone contact, it miraculously started. Due to our tight schedule, returning to the airport to exchange cars was not an option, so we agreed that if it happened again, we would stop using the car. Miraculously, after four days, on the last day, while on our way to the airport, we stopped at a gas station to fill up the tank before return. After refueling, the car wouldn't start again! Tried all the phone numbers on the key and the rental company number, but none worked. The rental platform's phone said they couldn't help and asked us to call the breakdown number. Rushing to catch a flight, after about forty minutes of attempting to start it, it worked again! The car had only around 7,000 kilometers and was a 2018 model, so it should have been in good condition, but it was definitely a problematic car! Originally rented a Volvo V40, but was told at pickup that it was upgraded to a Jeep Wrangler. I thought I was lucky, but later felt it was a trap! It was a scary experience!