Last mile through roadrunner for YOUR customers?

Has anyone ever had any luck getting an agreement with Road Runner to use them as last mile for your customers? I've noticed a handful of companies that are currently doing this with them, but when you contact Road Runner they act like they don't know what you're talking about (probably because they don't??) Anyway Im just wondering from a technical standpoint if anyone has done this and how it is done. Thanks, -Drew