I too got the call and call in today to "discuss it". Since two of my stations have given me waivers for the west coast feed, I don't see where this is anything BUT the DirecTV "system", and needs to be "tweaked". If you were to get the DNS service because there was no local service and now there is, that could be one thing.
In my case local HD has been here for a couple of years co-existing with my two DNS channels. Nothing has changed [other than the loss of the east coast HD feeds]. DNS is something DirecTV hasn't ever really wanted to deal with. In the past there are a dept. that the customer could call, but today's supervisor "claims" they can no longer transfer call to them, though they still exist [the dept.].
Unless the station revokes the waiver, I don't see a reason for this other than "blanket housekeeping" on DirecTV's part, and so far haven't "heard" any valid reason/excuse for "the call".