You need to contact the organization with whom you tested in order to request a replacement card.
If you tested with North American Technician Excellence (NATE): Contact asknate.org. Webpage: https://natex.org/contractor/epa-608-technicians.
If your card has “ARI” or “AHRI” on it: Contact Video General Incorporated (VGI), the testing organization for these cards: Contact 1-800-886-4109. Webpage: http://www.vgitraining.com/EPA_Home.html.
Alternatively, you may contact one of the following common EPA 608 Testing organizations to issue you a replacement:
ESCO Institute
1350 W. Northwest Highway, Suite 205
Mount Prospect, IL 60056
(800) 726-9696
Ferris State University
1020 Maple St., Rm 117
Big Rapids, MI 49307-1676
(866) 880-7674
Refrigeration Environmental Protection Association (REPA)
348 Thompson Creek Road, Suite 303
Stevensville, MD 21666
(800) 435-3331; Fax: (410) 827-4484
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EPA Section 608 Technician Certification webpage: https://www.epa.gov/section608/section-608-technician-certification-0