The PC5740 appears to be an older EVDO Rev 0 card.  Perhaps Verizion is having only difficulty maintaining support for EVDO Rev 0 devices in your area.  Since Verizon is offering to let you out of your current contract, you might investigate whether or not a new contract with a current-technology, twice-as-fast EVDO Rev A device available from Verizon would be a solution to your connectivity problem.  (Or do you you simply prefer the old contract terms?)

Dave