AutoNation Toyota Arapahoe

My experience has been awful broke down 15 hrs after purchase and 5 days later, tried to return 9 days later inoperable for 4 days but still under 250 miles the 250 mile unconditional return was denied, the manager offered to buy back at a depreciated value..its been in their shop now for 6 days ..feeling ripped off Autonation please do the right thing, At this point I would not recommend autonation to anyone unless they make it right, I want to return this vehicle ..what do you say autonation