Qwest is not owned by Verizon.
However the idea that someone could believe that is a triumph of marketing as a tool of misdirection and misinformation. Think about that and realize that many many people think that because a candidate puts non partisan next to there name, that it really means they are non partisan rather than a stealth Republican trying to get elected in a Democratic majority area.
Qwest recently switched from peddling sprint/nextel as there cell service to selling verizon cell services.
Long ago qwest sold off their cell subsidiary ("One" something or other) while absorbing some group of CLEC's and finessing the tarrifs.
DSL is probably not oversold at qwest.The same wire that carries your phone carries your traffic and is limited by the speed of light and the length of the wire.
It might be oversold at the Qwest ISP portion (still MSN?).
All phone service including internet, is provisioned on the basis that not every customer will use the system at the same time. This has been the core metric of capacity planning since the first switch replaced the manual operators.
Your DSL signal is transported via ADSL via a single pair of copper to the CO (DSLAM) then handed off via ATM to the ISP where it becomes subject to IP layer routing, switching, traffic shaping and latency introduced by aggregated network traffic and over-utilization (overselling) of hardware.
Qwest CAN implement traffic shaping and optimization at the DSLAM but it is far more likely that the ATM link or the router at the ISP end is where rate limiting or traffic induced latency occurs since they sell massive fiber connections to the ISPs and are happy to force capacity upgrades on those upstream customers.
If you choose MSN as your ISP, you get whatever MSN decides to give you. When companies reach a certain size, they don't listen to customers anymore and as long as the churn rate is overall positive, no VP's are denied their golden parachutes. Customers are statistics.