Purchase online 3 weeks ago and has not been fulfilled - i ever regret!

I made an online purchase during Makro's black friday deals specials with the option of delivery. The site specified that delivery would take between 2-5 days after a week of waiting and the status of my order "in progress" I then made telephone and email contact with Makro and was told that they did not have stock and that i should expect between 3 - 7 days delivery. Surely the allocation and logistics should work in a manner that if no stock is available then you cannot make the purchase? I have attempted at making contact on the second week and still cannot get a hold of them on email (no reply) and telephone (no answer and it just cuts off). This is rather disappointing as there seems to be no care involved in the matter - if this is a business transaction then the online team should fulfill their guarantee. I have made numerous attempts after the 3rd week to no avail, please can someone make contact and let me know what is going on and if i will get my items before Christmas?