Hi Tillyboo
Unfortunately it doesn't go against any 'rules'. The DWP has the right to verify the IDs of claimants, and they have the right to do it in almost any way they can. Some people, like yourselves, have been unlucky because the system hasn't always worked as it should. As a result, they seem to fail a couple of the methods and end up with a home visit. There is nothing 'legally' that you can do about this. You have already updated your MP and unless they intervene I don't think there is anything you can do.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems