That is the second mechanic telling the new radiator is leaking

Tweet

I totally convinced that the new installed radiator is leaking, and Merlin Auto care shop near my house simply denied their responsibility to repair it for me or give me a new radiator. Last time, I brought back my car and ask them about the leaking situation of the new radiator, their mechanics simply told me they found no leaking, and it was probably something else. They simply denied it and avoid to deal with me. Today, I brought my car for oil change at Precision Auto Tune care, their mechanics took a look at it, and told me that radiator definitely is leaking. The antifree liquid was surface around the edge of the radiator. Gosh, if I brought back my car and accuse them again, they probably will deny it once again. What should I do? I usually visit their shop for oil change, and other major repair, since this incident, I lost faith in them, and I even go to their corporate website and file a complaint against this store too.