Subaru Service center gave my car to someone else

So I dropped my Subaru WRX off to be serviced at an OFFICAL Subaru service center. They called me to tell me my car was ready for pick up, when I arrived today I waited around 2 hours while they were "getting my car ready for pickup" to finally be told that they accidentally gave it to another customer. They offered a rental car for the meantime until they can get it back which they said would hopefully be in the next few days. Should I take any action against them/is there any action I can take against them.EDIT:Thank you all for all of the advice. I'm not good with legal stuff and if I had not posted here I probably would have walked out paying for a rental car. I called the cops and the employees got mad and stressed out immediately. Turns out one of the managers took it for a joyride and wrecked it which they admitted to while I called the cops. I still have not seen it but I was told the damage was extensive and that I would be held liable for payment to fix part of it. At this point I'm going to get a lawyer involved right? I shouldn't have to pay for anything they have messed up on. Even if they offer to cover fixing it I'm a little uneasy about that. now that it has been in a colision is has much less value and could be prone to future problems. They if I didn't get lawyers involved they would "cut me a deal" but I'm really not having that. Not to mention they have been lying to me for hours.My location is Washington DC via /r/legaladvice http://bit.ly/2RCK8q6