We had a DS3 install a few years back and SBC showed up on the committed install date, said, gee, we don't own that multiplexor. Fine, I said, go get one - this is the promised date. Took 5 months. Basically the MUX in the building was leased to a company going bankrupt and SBC simply dragged their heels till they could take it back rather than install one to meet their promises.

At a prior company we took over office space with a Centrex system. SBC never did figure out what type of system we had and repeatedly sent the wrong techs to troubleshoot. We moved before they got it straightened out.

At the new place they put in a data T1. Don't even get me started....