In effecient service

Initially was impressed with the idea of the service however as we progressed through the service it seems like a very inefficient system . First the mechanic came out to wright a report . Then the second mechanic again wrote just another report . Then the 3 rd one came out and wrote another report with another quote . Each time they bill me for a mechanic to come out . It would be much easier taking the vehicle to a mechanic down the road and diagnose the problem one time then keep paying for different mechanic skills . Each time they send a new mechanic it’s for my expense . Their incompetence is something I have to pay for . Why not send someone the first time that can diagnose and repair . They will say perhap they don’t have the parts but I should have have to pay a fee each time their mechanic is not qualified enough for the job and they have to send a higher skilled agent . It’s quite the ****