Awesome Lube III

I had an oil change done at awesome lube and they didn't replace the oil drain plug correctly. Needless to say, it came out while driving the vehicle and damaged the engine. I am having to replace the engine, which in all is costing approx. $6000.00. Awesome lube is claiming NO responsibility at all so the cost of the engine replacement is coming out of my pocket. The only way around this, it appears, is to sue them. Be careful, they'll do a fine job, as all oil change places will, but if they make a mistake, that's when you'll see the difference because they'll leave you high and dry and find ANY reason they can to not have to claim any responsibility. They're blaming ME for the damage, although the engine was grinding and the car died within 30 minutes of the oil change...