Whatever the outcome, be sure of one thing; DONT be a little bitch on the phone or in writing. Be polite above and beyond the call of duty. Be clear and consise, do not argue.
Why? Because you being upset or sounding upset will probably get you flagged in the system. Remember it's another human being you will contact and they may have a bad day, or be stressed out more than you... and there's no rules apart from their judgement to start a process you'd not want to be a part of.
If it fails, take the blame and admit to making an uninformed mistake. They should understand that mistakes do happen and not do anything else than follow basic procedures.