This is wrong in principle As are the caps in the first place on a wireline DSL connection where you have dedicated bandwidth back to the VRAD or CO.
However, in practicality, this means literally nothing. The Microcell doesn't use much of any bandwidth. You're looking at maybe a few MB for a phone call, if that. Text messages use effectively zero. It just doesn't affect your home broadband usage, as it falls WAY below the noise level of random broadband usage. Watch one YouTube video, and you've used more than the MicroCell will in an entire month.