Jiffy Lube M.C. LLC My car's engine was destroyed due to the oil reservoir being empty. Salem, New Hampshire

I brought my car into Jiffy Lube in June of 2011.  I purchased the signature service with upgraded synthetic oil.  After driving some weeks later, my engine started making knocking noises, and what sounded to be "flapping" noises as well.  Upon bring my Ford Escape Hybrid to the local dealer, I was told that the engine was dry of oil.  I was also told that there were no leaks!  I was also informed that the engine was destroyed, and would have to be replaced, at a cost of over $5,000.  I got a second openion from an independent repair shop, and was told the same thing. Upon contactig the Jiffy Lube store, I was told the it wasn't their fault, and they refused to help and hung up the phone on me. They claimed that they put a number of quarts into the can, yet I know that the oil is added manually by employees via a hand held "gun" dispenser.  I am looking for justice through the State of New Hampshire court system.