how to complain china post and my courier NO : RB972106120CN how many receive my courier

RB972106120CN Collection Shenzhen IN Sun, 02 Mar 2014 02:27:00 GMT
RB972106120CN Opening Shenzhen IN Sun, 02 Mar 2014 16:51:00 GMT
RB972106120CN Dispatching Shenzhen IN Mon, 03 Mar 2014 10:32:00 GMT
RB972106120CN Opening Shenzhen IN Mon, 10 Mar 2014 08:52:00 GMT
RB972106120CN Dispatching Shenzhen IN Mon, 10 Mar 2014 13:22:00 GMT
RB972106120CN Opening Shenzhen IN Mon, 10 Mar 2014 17:02:00 GMT
RB972106120CN Dispatching Shenzhen IN Tue, 11 Mar 2014 09:25:00 GMT
RB972106120CN Opening Beijing IN Sat, 15 Mar 2014 17:42:00 GMT
RB972106120CN Departure from outward office of exchange Beijing IN Sun, 16 Mar 2014 09:51:00 GMT
RB972106120CN Delivery to airport Beijing IN Mon, 17 Mar 2014 04:00:00 GMT
Your parcel was dispatched on Monday 17th March 2014 and is now transporting to you it normally takes 15-30 days to arrive

but not receive so how complain china post my courier no RB972106120CN

if I was you I would contact the seller

sir my post is rejected how to slove my problem