Walmart complaint: new tire in auto center

I was told that 4 new tires was a 2-hour job I was there for 5 hours I watched the guy and he was moving very slow. the right rear tie leaks as I have had to put air in it twice in less than a week. on the way home my cars air conditioner stopped blowing out cold air, I took it to the shop today and he said that something hit the condenser in the front of the car I didn’t hit anything and it was working great until I left the store. this is going to cost me over $500 I know that the employee will deny he did anything to it and I have no proof he did. Maybe the store has cameras ot there in the service center and they will show something.I didn’t hit anything to damage the condenser but somebody did andit quit working on my way home. And why did it take 5 hours for a 2 hour job.I spent over $500 dollars that day and I continue to shop at Walmart but 5 hours one tire leaks and something hit my a c condenser I believe it happened there I am ver dissatisfied with the whole experience.Maybe he hit the curb when he parked my car. All I know is it was cooling just fine until on my way home and I didn’t hit anything..