And utilities charge for service too.
Voice only requires a small amount of bandwidth and thus is fairly cheap, internet functions running constantly require much more bandwidth and thus are fairly expensive.
If it is too expensive, do your high demand apps (shopping, video, etc.) on a connection with a lower cost per byte.
Very few if any places have shutdown DSL, though little effort is going into expanded DSL, upgrading service, or doing non critical line maintaince.
If your job doesn't compansate enough to pay for the nessecary/required tools like a cell phone (and if NESSESARY streaming video,high speed wireless) then it's probably best to change to another profession ASAP.