Is fax the best and fastest way to correspond with equifax

I’m trying to obtain a fax number for Equifax. Can you help? Also, is sending a fax both the best and fastest way to correspond with equifax.
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the only way to keep an accurate record and documented delivery of the record
is
certified delivery mail. delivery.
send it 3 day mail, or next day,
or regular certified delivery
ask the United States Post Office person to tell you how long the mailed letter will normally take to go from zip code to zip code.
http://www.oskie.com/credit-dispute.htm
here are the addresses.