Montfort Height Auto Service charge me to clean my throttle, all i need was a new thermastat cincinnati,ohio 45239

I took my car to monfort height auto service. I told them my car was overheating, that it maybe the thermastat,they said they do a diagnostic test on it. They informed me the problem was that I need an oil change,and my throtter need to be clean. So the work was done. I pick up my car. Just 15 minutes into driving the car,it started to overheat again. So I had the car towed to another auto service, There I was informed I needed a thermastat,by me driving the car for 15 minutes, I cracked my head gasket. I was charge for work I didnt need at Montfort Height Auto. Now I have to Pay for a new head. Thanks to Montfort Height Auto.