Koons White Marsh Chevrolet

I am very disappointed in the handling of my tire replacement. This is the first time I have leased a vehicle, and my assumption was, from the information I was given, that any repair/maintenance of 'your' vehicle was covered by the lease. My 2016 Malibu has only 1800 miles on it, and a few days ago,I noticed that one of the front tires had a bubble on the side of it. I promptly took it to Koons, expecting a repair or replacement of this basically brand new tire, to be covered at no cost to me. Much to my shock and disappointment, I was told that the tire was my responsibility and this brand new tire would need to be replaced to the tune of $371.39.....ONE TIRE! I think I was in shock, as when I thought about it later, realized that since I now had to pay for this, I could have found a much cheaper price elsewhere, and now had to go through Koons Service Dept. I'm sure that this tire has a manufacturer's warranty, due to the low miles on it, and that Koons will probably benefit from this. To me, it's obviously a manufacturer's defect, as there's no way a tire with 1800 gently driven miles on it, would perform this poorly. I would like a refund of the money I had to unexpectedly and disappointedly spend.