Can't log-in to facebook without mobile phone number

unfortunately I've never owned a mobile phone (elderly) but do have a regular home phone(land-line) which includes voice mail. I read your wonderfully simple steps to recover your account but right near the end where you say there will be two choices for sending the confirmation number to; email or instant message.... my box has NO such choice and therefore I can't move forward into my Fb account. This is sooooooo frustrating. I can't even find a "Contact Us" section on Facebook and have been through all their "Help" sections looking for my trouble to no avail so have turned to you. Any suggestions?