Advertise but do not have stock

In the Clicks adds valid from 25 February to 22 March 2015 it advertised Caltrate Plus 90 tablets for R149.00 (value pack). <br> <br> I went to Monumentpark, Pretoria, Clicks on the 26th February and they told me they don't have stock and I must come back next week because maybe they will get stock on Tuesday. <br> <br> On the 27th February I went to clicks in Sanlam Centre, Pretoria and they also didn't have stock and told me to come back late next week.<br> <br> How can you advertise something that you don't have stock in your shops ? and it is not that the Caltrate was sold out, there was no stock from the beginning.<br> <br> Does Clicks realize it costs money to pay petrol to drive to their stores for special.<br> <br> Very unhappy.