CableCARD channels have disappeared

Yesterday I upgraded my service from basic cable + blast! internet to basic cable + extreme internet. No changes should have been made to my tv service, yet all of a sudden my HDHomeRun Prime CableCARD box can no longer detect any channels. I've sat on hold multiple times, had signals "sent to my box", etc, to no avail. Can't someone please help me get back the channels I'm paying for??