<human>: Could you distill the essence of the text into 1-3 sentences?

Hi. I rented a Toyota Camry from car rental place yesterday in order to go on a mini-road trip a few hours away. Today, during a routine traffic stop, the policeman noticed an open container in the back seat of the car. My sister (also my coworker) used her company discount to rent the car, so she could be in deep trouble if I happen to get a ticket for this. I'm currently pulled over while the police officer discusses this with his colleagues. 

On top of this, I can't get ahold of anyone from the car rental company. The over the phone reps I have spoken to have been incredibly rude and apathetic. Yesterday, the representative at the desk charged me twice what she quoted me originally, refused to take my company discount and would only take my sister's (even though we work for the same company).
<bot>: open container that is NOT mine left in rental car that I just rented. Currently pulled over. What do I do here? Is the rental company liable, or am I?