No delivery for online order

I often place online orders for books from Exclusive Books but my latest purchase has left me pretty angry. They gave me 10 August as delivery date and two weeks later I still have not received the goods or heard from a customer services representative. In the meantime I have tried contacting the team twice via email and once on their website and still no one has bothered to get back to me with what is going on with the order. I have fully paid for this and really need the books urgently now. What bothers me the most is not that the delivery is late, but that no one has rep**** to my queries or informed me of the delay.