Sony Computer Entertainment is handling support for Borderlands 2 on the PlayStation Vita platform. As a result, players experiencing trouble will need to reach out to Sony for support with that version of the game, as well as any issues that might arise with the company's catalog of hardware.
Sony PlayStation Support Information:
http://www.us.playstation.com/support.aspx
Sony Computer Entertainment America Consumer Services
P.O. Box 5888
San Mateo, CA 94402-0888
1-800-345-SONY (1-800-345-7669)