1997 Chrysler Sebring leaking head gasket

I think that my car was misdiagnosed because I was told that I had a gasket slow leak from my car about 4 years ago. At that time I was told that if I plan to keep the car maybe I want to fix it if not keep my eye on the oil, get it changed every 3000-4000 miles and I should be okay. I did this because my plan was to sell the car. I decided to keep the car and took it to a Midas to have brakes done and my check engine light was on. They told me that I needed a valve cover gasket and oil pan gasket. I knew my car was leaking oil and I remebered that it was a gasket so I told them to fix it because I decided to keep my car. I took my car back to Midas several times; however my car continued to leak. I then a few months later took it back to the shop that had diagnosed the oil leak four years prior to see if Midas had fixed my car. I learned that Midas did not fix my car because it was a head gasket leak and not what they fixed. I decided to sell the car before winter because I did not want to pay $2000.00 the cost of having the head gasket fixed. I had already paid Midas close to $2000.00 for what they did on my car. Well, the car ran hot and I was told that if I drove it the engine could lock. I want to sue Midas for not diagnosing or fixing the problem. The shop that diagnosed the head gasket leak said that they should have detected that the oil was coming from the head gasket as they did. Do you think I have a case?