Shocking service and no customer satisfaction whatsoever

A technician was able to run diagnostics on my vehicle and pinpoint the problem as the gearbox - Century City is unable to find a fault. Clearly I imagined my vehicle losing power then and after two and a half days with no feedback all I get is a bad attitude and no assistance whatsoever - how long would you like to keep my vehicle to run diagnostics surely it is computerised and your diagnostics should be the same as the technician? Silly me of course my car is almost out of motoroplan perhaps you are waiting until it becomes a cash deal and what would I know as a woman? This is my third A class - do you not want repeat business?