Makro Online sales a complete ****!!

Makro online buying system is a complete ****. I logged in to buy a Russel Hobbs straightener and Hair dryer on special. After completing the transaction successfully, i was called 4 days later to be told that firstly the hairdryer was not in stock so I would only get the straightener. However, 2 days after that, I recieved 2 more calls to say that the straightener was no longer in stock so i would get nothing. Now my question is 1) how do you one minute have stock and advertise it, then the next minute after people have paid you do not have it 2)Secondly if there was initially the straightener left where did it go to after the 2 days? 3) why does Makro online advertise items they do not have? which is a total waste of the consumers time and resources 4) Did they really not have stock? because I have heard several complaints from peers about Makro staff keeping specials for themselves and just telling online customers that they are sold out. 5) Why are we only informed that there is no stock 4 days after payment and order confirmation.