I am a relatively new owner of a used 2018 Model S 100D. 62k miles so out of warranty. Three weeks ago the car started throwing up a couple of error codes saying vehicle may not restart and to take to service. The Service rep upsold me on the annual checkup for 900 bucks. The issue turned out to be a battery replacement BMS u008, BMS w172 to the tune of about 600 bucks. The diagnostic process also urged me to get rear brakes replaced at NEXT annual service anniversary. When I drove off the lot, I immediately heard a recurring tick in right rear of the car and it was taking bumps very hard. Two definite issues that were NOT there before I took it in for service. Drove it right back to the center and left it there (it was after hours) as well as detailed these new issues via the app. They just called and said I needed to get new rear brakes (recurring tick) and replace the suspension bar (bumps issue). I told them neither of these issues existed ever before THEY serviced the car and the brakes presumably had another year on them. I told the guy I was unwilling to pay this and want these issues resolved. He said he agreed with me but needed to talk to the tech who worked on the car who wasn't in yet. I havent even looked at their estimate for the new work, I am so upset. Can anyone provide perspective or shed light on what seems to me to be a disasterous service experience? What should I do? TIA