Nov 28, 2013
Delete the PS Store application & re-download & re-install it, also check your time & date on your console & make sure they are correct.
Customer Service - 1-800-345-SONY (7669)
Account & billing Support -1-877-971-SONY (7669)
Available Mon to Fri 8am - 8pm PST
Live Chat Available Mon-Sat 6am-10pm PST & Sun 6am-8pm PST