Debit order premiums date changed without notice

Discovery Health are the administrators for Bankmed from 1/1/2016. Debit order premiums went off on 25th this month different date to what had originally been signed for! Without any prior advi*****t to members, or written authorization from members being in agreement to change debit order dates. Bankmed consultant advised they receive instructions and work accordingly, 25th is the last date for debit orders to go off. Consultant also advised they would still be advising members. Who signed the new debit order authorization on my behalf? No one should be able to change debit order details without the signature of the account holder! How can one implement changes and then only advise the members? This is not the service one would expect from a corporate company. <div><br></div><div><em>(Supplier name changed from Discovery Health to Bankmed by Hellopeter.com)</em></div>