Can I get a refund for unused minutes purchased on a pre-paid plan?

I have a Go-phone, pre-paid plan, with a charge of ten cents per minute.  When my minutes expire, I always refill my account by purchasing an additional $100 of air time, so I can transfer my unused balance for another calendar year.  I hardly ever use this phone, which is why I purchased this plan, and I now have a balance of over $400 of unused minutes.  I am a senior citizen on a fixed income, and $400 is a lot of money to me.  I now want to cancel my phone service, due to lack of use, and want to know if I can get a refund for the money I pre-paid.