Ali Express — Not received product

Address:

China

I did not receive my product when I tried contacting the seller they told me to contact local post when I went there they told me the order has been delivered...
but I did not receive...and they didnot help me
I filed a dispute they said they can’t do anything
They asked me to prove...
How can I prove I didnot receive the parcel ?
You guys show me the proof or signature showing you have delivered to my address...
My order no is [protected]