DHL Status: Return to Shipper???

Like most people, i got my tracking number for the free case. yet my tracking number no longer works, when it did the status was that it was sent to the Postal Service, a few hours later it stated "Return to Shipper" and i havent gotten anything

Its been in Chicago for 7 days now so i dont know if this is a problem for everyone or is just me?
I dont really know how DHL works so.....

never mind it says
"Insufficient Address"

I have to call USPS tomorrow.
What makes me more mad was the fact i could have called half an hour ago before the closing time

Ok, so today i checked my tracking number and it says DHL has sent the package to USPS and later was labeled "Insufficient Address" and was labeled in the DHL tracking number "Returned to Shipper"

I was already half an hour late to call customer support but i dont know if they still have the package, and i am not to confident that DHL would have received the package too

So what can i do in this situation