I've only done the free vacation offer once and the problem I had with that was minor. Now I never accept it.
You could try moving the household to the bin and then back to the neighborhood. That seems to work to fix a lot of issues but I don't know if that will work with this. And I think doing so will probably make your sims lose all their relationships, so it's probably something to try as a last resort (and on a test save game in case it doesn't work).
If you have NRaas MasterController you might try resetting the lot, or the whole town before trying so drastic as moving to the bin and back.