Worst Courier Service Ever

I am still waiting for my package to arrive. I was promised it would be delivered on the 24th before 5pm by the call representative I contacted but nothing came.. I ordered this package on the 14th of December from Cotton On and it was in their possession on the 15th it is now the 29th and still nothing. I have called and emailed but their communication is so poor I doubt I will ever receive my package.