Business ProfileforModern Auto

In January I purchased a used Jeep Liberty from Modern Auto. It had ******* miles and came with a 3mo/3000mile powertrain warranty. In March, approximately 200 miles after our warranty had expired because of over mileage, I got 3 check engine lights. P0300, P0304, P0456. After reading about the codes I decided to change spark plugs, coils, and wires. I also replaced the gas cap. The codes went away for a few days but came back when the car began to overheat. I was already disappointed after spending $10,000 for a car that potentially needed more than a tune up, now might not be in driving condition. I left a 1 star ****** review online. A few days later I was called by Modern Auto and asked why I blindsided them with a review but never gave them a chance to make it right. The individual I spoke with claimed he never gave 1 star reviews to anyone before and just couldn't understand why. I said I was outside of my warranty and didn't expect I would have got any help. Meanwhile the Jeep was at a local shop for evaluation. Modern Auto asked me to call them when I found out what was wrong with the Jeep, and I agreed I would. The diagnosis for the Jeep is a blown head gasket / possible cracked head. The mechanic I took it to said he would not do the repair and to take it elsewhere. I called Modern Auto about this and *********** said he would speak with his manager and get back with me. Unfortunately I did receive a call from them today and they stated that because I had changed my spark plugs before they could look at it, there is nothing they could do for me. I feel like this might be retaliation for the poor ****** review that I left. But now I am stuck with and an overpriced used car that will likely cost me a few thousand to repair only 2 months after purchase. Apparently my values do not align with their business model. Buyer beware.