Why didn't you go over to re-do the FP if you had such experience in the past? I am afraid you are delaying your own process by ignoring the request. Even if the FP letters were sent in error (duplicates), I would still go and re-do them or at least have taken the InfoPass appt than just ignoring it.
If you choose to ignore, you may be waiting for you interview letters for a very long time.
If you choose to ignore, you may be waiting for you interview letters for a very long time.