[poorlyduck]

So last week I sent the phone, the label was already in the envelope, all I had to do is put the phone inside and ship. Now sprint is emailing me that they didn't receive the phone yet and they might charge me from $50 to $200 wtf? the return tracking number that I have in my email isnt showing any process, I dont have no prouve that I sent it , its all in post office hands. I dont know what to do, any advise?