help answering my question on return.

[sjrickli7]

I was eligible to upgrade jan 09 so i upgraded to a sprint htc diamond. I found out there were 3 dead pixels and i returned it at the sprint corp store. When i got my second diamond, the lady said that i'm limited to one discretionary exchange. And the next time i'll hafta get a refurbished one. So i got my second one, and i later noticed it had 1 dead pixel and the usb port is very loose (my first one was good except the 3 dead pixels)

I'm still before the 30-day return policy. Will i get the exact amount i paid for, back? And what happens if i sent the mail-in rebate already?

I was thinking about just returning this phone, switching back to my old plan. And wait a week and upgrade again for a new diamond since i'm only limited to one exchange. Will this work? Or will my eligibility be terminated the second time? Or can i just go to the sprint corporate store and ask for another exchange?

Any insight/answers to my issue is greatly appreciated. Thanks.