Hopkins Hitching Post sucks (Lawsuit???)

[1QUICK4]

I took my 85 Max to Hitching post in Hopkins to get a rear tire installed. It took the tech 4 1/2 hours to install it. During that time I watched him remove the rim and replace the tire. He then proceeded to assemble the bike and push it off the lift. As he was pushing the bike off the lift i saw him stop and listen to the rear end as he was pushing. He then proceeded to put it back on the lift a disassemble it again. Then reassemble it and push it while listening to the rear end again. He then put it BACK on the lift and tore it back apart.

Well he proceeded to so that assembe/disassemble dance SIX MORE TIMES! Eventually a parts guy came and installed it and they said it was good. The guy who got it in said the tech had trouble getting the driveshaft in correctly and if it popped out I could "kick his ass"

Skip to 1 week later and I get a clicking noise from the rear as I'm pushing it into my garage. I go drive it and there is a horrible howling noise you can hear coming from the diff area when I kill the ignition while coasting.

Needless to say I brought it back to them and they tell me I need a new diff and that it's because my bike has 35K miles on it and from "lack of lubrication" and it's only a coincident that it happened after they worked on it. I change my diff fluid every spring.

They tell me it's $1300 + 1 hour labor but he'll give me 15% off. I am not paying for them to fix it that's for sure.

What should I do? What can I do? What would you guy's do?

I am sooooo fricken' mad I can barely type this!