Hi granny earth mother,
I am sorry but we have no influence on whatever decisions Facebook makes to stop anyone using a Facebook account. You will have to try to continue working with Facebook to see why they won't accept the proof you provided to them. It is against their terms and conditions to open more than one Facebook account. Your farms are tied to your Facebook account so you will need to be able to access that Facebook account to be able to use those farms.
You can contact the support team if you wish and see if they tell you anything different.
http://apps.facebook.com/farmtown/settings2/support