Need Legal Advice For A Vehicle That’s In My Name But Haven’t Had Possession Of

Location: Pennsylvania
Last year, I started purchasing a car and was supposed to be paying monthly for it. It’s from a private seller. I was originally supposed to save the full amount and give it to them in one go, but my uncle, who set me up to buy the car, gave them the $500 I gave him to hold onto since I’m not the best at saving money. Around this time last year, they cut contact and when I finally got them to respond to me earlier this year, they flipped and said I cut contact. I’ve been messaging with them every day/week since March this year asking for updates on the car and when I could come get it. They kept telling me “you’ll have it by the day you need it” if I gave them a specific day. My bf, who I live with, is going out of town next weekend and is taking his car, which leaves me with no way to get back and forth to work as he lets me use his car from time to time if he’s off. I have communicated the day I need my car by and they’ve said I’ll have it by then. I just found out last night that he has ghosted the people he’s supposed to be buying parts from for the car TWICE. Mind you, I gave him money for said parts almost a month ago. I have not heard from him in a week and the only communication I’ve had recently is through his wife. The registration, title, and insurance are in my name. Is there anything I can do that will allow me to go get the car so my dad can fix it and I can get it inspected so I have my vehicle finally? I may be losing a better paying job without this car as well.