From The Social Security Administration’s Response to Telephone Imposter Scams, a report by Social Security's Office of Inspector General (OIG):
... The rise in SSA-related imposter scams primarily affected its field office and national 800-Number teleservice center staff. In Fiscal Year (FY) 2019, SSA estimated its 800-Number staff handled about 854,000 scam-related calls. Also, in FY 2019, the OIG received about 65,000 scam-related allegations from SSA staff—an over 1,000-percent increase over the number of similar allegations SSA staff sent in FY 2018.
Time spent responding to scam-related inquiries and making fraud referrals deflected staff from completing their normal workloads. SSA estimated it spent over 100 workyears in FY 2019 on these and other scam-related activities at a cost of $8.4 million. Per SSA, it takes 100 workyears to process 6,000 initial disability claims, 43,000 retirement claims, or 270,000 Social Security number card requests. ...