Van Buren Buick GMC

They sound and look professional but they are not. Had the car drop off to be fixed for a knocking noise under warranty and in about a month later had to return it for the 2nd time for the same issue . I was told a week later that the warranty has expired and I will be charged for the repair. After 2 weeks of negotiation I agreed to pay a portion of the bill.I was told by Collen It should take about 3 days to fix my car but it took them another month to repair it . FYI the car still has a knocking noise