I took my car into their service center for an oil change and to get my summer tires put on my car. My vehicle had been in the shop for approximately an hour when I received a phone call that they had broken one of my valve stems on one of my tires and I was required to pay $150 to replace a part that their mechanics had broken. When I returned to the shop to pick up my car I explained that I didn’t feel that I should have to pay for a part that was broken by their service crew because there were no signs that the part was broken prior to dropping my car off to them. I was told by the service person reporting at the time (Erick Dodsworth) that the part in fact was broken prior to me bringing my car in because when they removed the plastic knob on the valve stem that the internal parts of it shot across the shop. I feel that if this particular part was broken in the way that was described that I would have in fact had a low tire or a warning light on my dashboard from my tire pressure sensor warning me that there was a leak in my tire which was not the case. I was forced to pay the $150 to get my car back which was not all that easy to swallow due to the fact that a valve stems approximate price is $6, so i’m a little confused and angered that the replacement of a $6 part could cost anywhere close to $150. This morning (the next day) I attempted to call the Platinum Mitsubishi service manager to discuss the charge on my invoice to which all of my calls and messages have been ignored up to this point.