Business ProfileforMidlands Carrier Transicold

My problem is with their subsidiary in Florence SC, name of the business is MCT Companies/Carrier Transicold at *** * ******* **, Florence SC 29501. I had a problem with my carrier reefer unit and we took it to their shop, 30 minutes after check in technician check over the unit and told us that EVO T sensor needs changing and let us know that the job will be done in 2 hours. Unit went inside the shop at 9:00am local time and it was done at 11:00am local time ( exactly 2 hours ). When i received the invoice from them i saw on the invoice that they charged 65.38$ for the part itself and 1425.45$ for the labor. That is way more then 2 hours labor. When i called to speak with the service manager and ask him why i am charged way more then the 2 hour labor for the job, his response was by their book they need to charge 8 hours of labor even if they finish in 2 hours. Service managers name is *** ****** his email is *********************** and his phone number is ************ . That is not making any sense to me, even more because the technician told us that the job going to be done in 2 hours. I don't know what kind of business runs this kind of scams. But this is pure rip-off and highway rubbery. I want billing adjustment for the labor they actually did on my unit. Thank you