Viking Automotive Charged me for services I didnt need midvale Utah

I am very frustrated with Viking Automotive.. I took my car in after I had someone else look at it that wasn't a mercedes repair person.  The original place I went to thought I had engine problems.. I was referred by someone to Viking..

I ask the viking specifically if they worked on Mercedes, they assured me that they work on all the time.. I brought my car in and explained that this other company wasn't familiar with mercedes but that it could have been the engine.. Viking agreed to look at it. 

They told me it wasn't the engine that there was an oil leak basically and that it would cost $1500.00 I was so relieved that I agreed to pay the amount they requested. When I drove off with the car I called immediately and said that the car was smoking still.

They assured me that was normal and that it would burn off, that it was left over oil.. I said ok but then after a week I called and said it was still smoking and that I was worried.. They again assured me that it was normal but that I could bring it in..

I went out of town but when I came back to the car was smoking really bad.  Afraid to drive it at this point I had it towed into Viking where they said.. Oh, I guess it was the engine.. I was so mad.. I said I want my money back. They said I can’t have it back because I would have still needed this repair done.

How am I supposed to even believe that.. Also if I would have known it was the engine, I would have sold that car “as is, needs new engine” I certainly wouldn't have thrown 1500.00 away.. It's like painting your toenails even though you need your foot cut off..

I guess if the foot grew back it would be great to have painted toe nails.. It is ridiculous that companies can mis diagnose a problem and still expect to get paid.. If a surgeon took out your appendix when it was your gall bladder it would be a malpractice suit!  I am just looking to get my money back from this fraudulent company.