Looks like Si has the right number, I didn't understand the renewal letter either, but first person I spoke too sorted me out

) Took me about 4mins on the phone to refresh mine and Wanda's.
Lifted from "Joys of caravaning.co.uk! :P!"
FOR INFORMATION, ENQUIRIES ETC.,
Email.
amanda.moser-wickles@sby.adac.de
or Telephone enquiries and to join and pay my debit/credit card phone offices Tel No. 00 49 94 15 23 44 and speak to
Ms Amanda Moser-Wickles, or Ms. Barbara Lorenz.
If you get an answer phone message when ringing this number it tells you in German they are extremely busy and to leave a message after the tone. If you leave, your name and telephone number and reason for ringing, they will get back to you as soon as they can. And they really will..