POOR SERVICE

I've ordered an item via CNA online on 24/11/2017 up to date I have not received the delivery. Their estimated delivery time is 2-5 working days. I phoned on 05/12/2017, where the operator told me that "she can see it was suppose to be delivered already" and she will escalate the query and promised someone will phone me regarding the delivery date. I also sent an email to CNA on the same day. Until today, I have not received any phone call or email from CNA. So I phoned again today, the operator told me "they were suppose to give you feedback by yesterday" and she will sent the query through to their line manager!! This is really unacceptable!