Sprint iPhone 4 issues

I bought a Sprint iPhone 4 from someone on eBay, and when I got it, I called Sprint to get it activated and found out it was still activated under someone elses account. I deleted my eBay account after I bought the phone and can't find the user I bought it from. What can I do? I lost my old phone last week and I need this phone activated NOW! I tried to call and get it deactivated & it says I need a pin or something like that.

Its useless as a phone, its a ipod touch now.
if you need a working phone email me, i have a few for sale or trade

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