When I test drove an EB, I noticed the interior popped, rattled and squeaked as much or more than my 2014, which I was also not impressed with.
The interior was nice, but the build quality was lacking considering it's an all new platform.
As for your issue, if that were my car, I would make them fix it and fix it properly.
99 Chevrolet Camaro Z28 M6 - 6.676 @ 103 in 1/8, 10.512 @ 130.2 on street tires, H/C/I
93 Eagle Talon TSI AWD 5spd - Built 6 Bolt, 16G Evo3, HKS 272 Cams - under construction
94 Mustang GT - 5.0 bored and stroked to 347, Vortech V1 @ 10 PSI, Tremec TKO 600 - PIA