Julian that really sucks, my guess is tha fact that you live in an apartment is the reason for your problems. The driver, in my opinion, is just too lazy/busy to bring the sub up to you and fudging those non-delivery codes they keep telling you about, just so he can do easier deliveries.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70