Bad service to the core.

I Lincoln find it strange I brought my vehicle in for a service the 23 November 2018 diacnosticts was done on the vehicle and I got a detailed report what needs to be done. When I return the vehicle on the 30 November 2018 with complains about the boot switch not opening from the inside. I had to pay for diacnostics the second time. You diacnostics revealed that there is a broken wire. Please forgive my ignorance. Why didn't your diacnostics pick it up the first place. What worries me how can you come back and inform me this is not related to the service but the vehicle was find when it went in. I paid for the diacnostics the second time on Friday. Saturday when we wanted to use the vehicle we discovered the the central lock is also not work. I will try and sort out this by myself, because I don't thrust yours at all. This is plainly bad service.