Hi there, let me first say I do feel a bit sorry about your experiences. Secondly, this is supposed to be a forum regarding china post tracking and your grievance appear to be not related to china post or even China at all.

But I did look up the tracking number you gave on 17track and it appears the item has been put on "Alert" status. http://www.track-chinapost.com/track.php?code=RR050990308NG&fc=0

According to 17track, the explanation for Alert status is:
"Item might undergo unusual shipping condition, this may due to several reasons, most likely item was returned to sender, customs issue, lost, damaged etc. General explanation:

Your package is being returned to sender due to any of these reasons: item refused by addressee; incorrect / illegible / incomplete address; expired retention period; addressee absence; etc.
Your package might be retained by customs department due to any of these reasons: contains prohibited goods; importation of the goods is restricted; retained by customs due to tax payable, or any other unspecified reasons.
Your package may have suffered damage or been lost during the transportation period.
If you ensure your package has been delivered successfully, please ignore this notice. However, if you haven't received your package and it is under the"Alert" status, then please pay attention: you need to read and analyze the detailed tracking information carefully. Due to complex description of worldwide shipping providers, we can't auto-detect and determine all the status 100% accurately, hope you understand. We'd advise you to contact the package sender or your shipping carrier for clarification."

My opinion is that the item has been detained by Sri Lankan customs. In some countries, mobile phones are items that require import permit to be brought in.

I think it is not enough to say that because the item was tracked to be in the destination country, then the recipient is assumed to have received it. You still need to ensure the status is "Delivered" then you have postal confirmation that the recipient has received it. In this case, perhaps you should have found out the customs regulations of the destination country before sending it. That's why in ebay, some countries are excluded from the shippable list for this reason. Perhaps if you have bought insurance before shipping, which I suspect you did not, this might have helped mitigate your loss.