Comcast says I'm using "too much", has anyone had this happen?

I have a 20mbps plan with Comcast and I’m not going to lie, but download 4GB files every day, two or more. They take around 20 min to complete. Real time saver.

Now Comcast, I know they have caps but they called me and said I’m in their “10% top users” and say I “hog” the connection. If I don’t slow down a lot, they’ll drop me, and I was just in the process of signing up for their 30mbps plan and phone service, but having second thoughts.

I have Verizon too, so It wouldn’t hurt me to drop them, instead of them dropping me. I was wondering, has anyone ever been notified about their usage? Why advertise these speeds and actively give them to customers if they can’t use it to their full advantage. Yes, they want Mom and Pop to get their email faster and download those cute family vacation photos faster, but we all know thats’ just a waste.