How to erase content on an inactivated iPhone that won't connect to Wi-Fi?

I have an iPhone 4s I would like to sell but I have a problem. It stopped connecting to Wi-Fi. I was told at Besy buy I would have to connect it to my computer to erase the content and maybe it would connect to Wi-Fi again. I can't connect to data anymore to turn off "find my iPhone" because the phone isn't activated anymore. Does anyone know how to fix this or am I just stuck with this phone?

Seriously? Why don't you just do EXACTLY what they told you to do? Plug it in to a computer with iTunes, restore/wipe it, done! How hard was that?

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