Got a great deal on a great vehicle but it ends th...

Got a great deal on a great vehicle but it ends there. Drove 6+ hours and then we were at the dealership for almost 4 hours because finance personnel did not have any of our paperwork ready and they kept trying to sell us the extras that we had no interest in. Speaking of interest, our loan rate increased from what we were quoted at the start of the day to when we finally signed the paperwork! We were told they could only accept a limited amount of down payment (probably a lie) but that did not concern us since we were told several times that making future payments with a credit card would be "no problem." That turned out to not be the case and when I spoke with finance after the fact I was told that she would never had said that in the first place, which was a complete lie! I tried to resolve this matter by reaching out to the dealership's GM via email, but he is apparently too busy for me because I never got a response. Lied to and ignored, no thank you!