Hi Brian
Welcome to the forum. While not an expert on Community law I am learning every day but if I am wrong I am sure that there will be someone out there who will be able to advise.
What a terrible situation! Was your Auditor paid or just an owner trying to be helpfull. I, as President of our Urbanisation (just over 100 dwellings) keep a tight reign on our accounts and the Adminstrators (very good ones by the way) do not have over all control of the finances. The Accountant at the Administrators signs the cheques but my monika is also needed. Have you spoken to your President over these concerns can she/he advise you.
Normally to do anything and I quote from your posting.
"Could we ask the Administraor to resign? Do we have the right to video and record the EGM as they are very keen on passing resolutions when no1 seems to actually vote as well!·"
you need the President to propose it. You can however call your own E.G.M. and write your own agenda if more that 25% of owners so wish and in this case it would be 10/11 of you, do you have this many.
Remember items NOT on the agenda at your next E.G.M. cannot be voted on, they can be discussed but not voted on.
If you did not agree with anything passed at your Annual General Meeting, either items passed or the accounts, then you had 12 weeks to say so. Once this has passed I am not sure if you can do anything about if but perhaps Maria or Roberto can advise.
You really need to speak with your President this is a vast amount of money for a Community your size and Administrators should always keep receipts and bank records.
As to recording the E.G.M. I can see no reference in the Horizontal Land Law to it at all so maybe you will be okay unless you had a previous vote banning it.