We had luck with option 3 as well. The first 2 calls they routed me to Member Services which I had read would not be helpful. The third call I got the membership number.
Once you have your member number, give member services a call (option 1). tell them you have your membership ID number, but need your club ID and activation code (you need these for online access and they are different than the member ID). If you make sure you have the link account box checked and use the same email and password, it will link to your my disney account.