I am a retired teacher in Minneapolis, MN who paid into and am now receiving a pension. I retired in 2008 but continued tow work in the same school district as an independent contractor. I paid social security for 5 years from 2008-2013. I have applied for spousal benefits but was denied because of GPO. Can I take exception to their ruling because I paid social security payments for 60 months? Can you provide any advice or suggestions? Thank you for your help.