I'm a little concerned regarding my order I purchased RC314690900CN its been showing Null

There is update now:
2014-04-29 06:30, WOODBRIDGE, Item processed at local delivery facility Learn More The item has arrived at the destination facility for final sorting before delivery. Look for an "Out for Delivery" scan today or tomorrow to know when delivery will occur. You can also sign up for email notifications. 0170
2014-04-28 07:56, MISSISSAUGA, Item processed 0100
It shows that your parcel has arrive in the destination country. Now you can check at your local post office.

Thanks for getting back to me, but I still haven't received my order. When I enter the order number to the destination postal service website I still get the message "Sorry There is no data available for this tracking reference, please try again later."

Oh, it is strange. Then don't check it online. Try to pick it up on your own at the local post office.

I have tried, they have asked me to make enquiries with the carrier.

The mail service in my country has has said "Unfortunately it is the sender of the item or their postal service who needs to investigate this matter further. We have no details that this item has been handed to Royal Mail and are therefore unable to assist further."

Sorry to hear this. Now you may have no choice but ask the sender or seller for further help! Contact him or her ASAP!