Napa Part's & My Pick-up?

I have a 1997 GMC Sierra K-2500 4wd pick up truck in August of 2010 the master/slave cylinder went out I went to napa bought a new one and had a local mechanic put it in. In December 2010, the master/slave cylinder went out and I got another one for free because it was under WARANTEE. Here it is May 2011 the master/slave cylinder that I got under warantee, went out!!! I have not started my truck since Feb 2011 because the clutch went completely to the floor. I checked and fluid was dripping under neath the truck were the silver cable meets the trans (where the cylinder is housed) It turned out that the clamp came loose and borke off. whic explains my it was dripping. the same mechanic who worked on the truck since august of 2010 came by the other day and put a clamp on. It ran great. The next morning the truck would not work right???!!! My foot was on the clutch, & the brake and the rear tires were spinning like crazy. My mechanic told me that that piticular master/slave cylinder was recalled a month ago because the company napa was getting them from were producing faulty parts. Come on 2 MASTER SLAVE CYLINDERS GONE OUT IN UNDER 12 MONTHS??! Now I need another one?! I told my mechanic Im not paying to get this fixed, nor will I pay to get the new part. The new part is made of some metal, not the MADE IN CHINA PLASTIC!!! Napa told me that they will pay for the part, and pay for the mechanic, but what am I supposed to do? I paid in good faith and napa sold me a faulty part? Not only once, but twice! Im pretty sure napa corporate knew about the recall on the master/slave cylinders long ago, told the local napa near me, but the local napa wanted to sell what was on their shelf before they start selling the new ones. I got 2 piece of **** master cylinders and now I need a new one. I need my truck what can I do? can I sue napa? Honest answers only, no crazy whacked out under the hood greasy monkeys!