You can go to the Certification Fulfillment in Cisco Tracking System.
If you already got the certification by impression or PDF file before, then you must to pay a price for a new copy.
You can consult to Cisco Certification Support, too
If you still havent gotten your soft copy from Cisco.
Please go ahead and open a case with the Cisco Support Team.
They will be able to assist you with this issue. You can contact them
directly at the following link: https://ciscocert.secure.force.com/english/