Quality of service was a matter that the commission found in CRTC decision 2006-15 could be looked to by competition. The problem may well be that the individual providers may take more care in the provision of service to their high-volume customers than to their low-volume customers, where it may not necessarily be all that attractive to increase the quality of service or the lines or install new facilities to serve, if it's not economically appropriate.
I think, in fact, service quality should be maintained in a deregulated environment, or, as an alternative, that something like a consumer ombudsman is put in place to report on these kinds of problems and highlight them for the regulator to take up with the companies.