Online order bad experience - not resolved!

I recently ordered quite a few pairs of Crocs using their online shop. I had two orders delivered to me in the week of the 27th of Nov. One of the orders had a pair of shoes not included (two of the three pairs I ordered arrived). I have been trying to get hold of the online helpline for almost two weeks now to try and rectify it. I have send numerous emails to the their support email address. I also tried to phone even the head office on a daily basis (apart from the online store helpline). The phone is either ringing or the receptionist tells me she will put me through and then just ringing and being cut off. I also left more than one message with the receptionist where I was promised that they will come back to me - no success. As luck has it, the pair which was not included is a Christmas present!