Legacy Motors Rip off and Caused my Car to be Re-po , Internet

Ok I got a Pontiac Firebird form Legacy motors in one month the Crank Shaft broke at least that's what they said so I paid $987 dollar for them to put another motor in which I told I was paying Half.  It was a used motor an I refuse to believe that was half I paid for the whole motor.  the warranty is a lie.  The a few weeks ago the oil pressure was going up and down I took it to them and the Said the Motor was blown I only had the motor for about 2 months.  So they said I would have to Pay 1100.00 to get it fixed.  they clamied that was my half so that would mean the motor cost 2200.00 and that's a bold face lie.  my warranty was supposed to be as long as I was paying on the Vechial another lie as soon as they sold my loan the didn't care about me anymore and one lie after another.  So I left the Car up there and ended up getting repoed by the company they sold my loan to.  They are working together in ripping people off.  Now I have a mark on my credit because of a flat out Lie.