Former conditional green card holder - what do I do now?

[Sparkling]

Dear Lawyer,
I posted my story in "all other green card issues" I'm sorry I don't know how to link it.

I am married to a US citizen - married since 10/23/04 - we have lived in the US before where I obtained a conditional green card : given 01/17/06 expired 01/17/08. We left the US in may of 07 to live in denmark (my home country) and thought the conditional green card was "gone" when it expired and did not apply to remove conditions in time.

In 2009 we decided to return to the states - I came here 10/16/09 on a visa waiver. In december 09 we filed i130 and in march i485 thinking we had to start over on the process of getting a green card.

April 8th -10 we recieved a denial letter saying:
"A review of agency records indicates that the beneficiary has already aquired lawful permanent resident status on january 17 2006 through other means"
" therefore , the beneficiary is not eligible for the benefit sought and this additional petition is denied"
" This denial will have no adverse effect on the lawful permanent residence status that the beneficiary has previously aquired"
Attached to the letter is an appeal form.

So my query now is: since they already consider me a lawful permanent resident according to that letter - how do I go about getting my green card? and what happens to the i485 that they still have in initial review?

My husband and I are very confused about all this - we were told we had to reapply so we are puzzled about that denial letter. Customer service at uscis only reiterates the content of their website and we cannot get through to anyone that can shed any light on this. Infopass is not available in our area either, so I turned to this forum.

Than you so much for your time in considering this matter and for any information you might have for us.

Sincerely,
A danish citizen :-)