Unprofessionalism

I am in the process of buying a vehicle at this dealership but I now have doubts because of their unprofessionalism and behaviour. Are they really legit? I have so much doubt. Pitty I have already paid them 50% and the balance in a month. They have so much street-wise communication style. they're like gangsters. I am somehow uncomfortable. I will let you know if my experience has changed when the deal is complete.