I was told I used more data than they allow (250GB). I do not argue that I used over 250GB, in fact I went quite a bit over. Though I did want to ask for proof that affected their network, I figured it wasn't the nicest way to start the interaction. I informed them that I used this because it was sold as "Unlimited usage for a flat, monthly rate." He then told me it said "access."
I had the brochure right next to me and quoted, "Unlimited usage for a flat, monthly rate." He told me their website says something different, and my local franchise overstepped its bounds, and their website overrules the "Important Information about our services, Charleston SC" sales brochure sent to me. If I went over again (It goes by calender month, not billing cycle) I would be disconnected for 1 year without giving me a call.
I asked if Comcast had a tool to help me monitor bandwidth. "Not in your market" he told me. "Download something from Google that will do it for you."