Never had any issues with customer service, and never had other Tesla drivers complain about it- and am frankly suspicious whenever I hear these things.
I bought my car in twice , they fixed the alignment for nothing the first time , and recently after driving back and forth from NY to Homestead Florida, and NY to Key West Florida and back, took the car in for a check-up and wasnt charged for any of it. the first time I was given a loaner Model S, the second time an Uber Voucher for $100.