Pick n Pay deceiving "Specials" ads

Pick n Pay N1 City had, amongst others, a Lamb special for R99.99 pk for period 16-20 Nov. On 16th Nov. I bought a lamb pack but when I arrived on 17th I was, along with others, were told there no more lamb packs because of Supplier. Whatever that means. Why don't they post "while stocks last". What good is it to advertise a special for 5 days but they only have 1 day's stock?? Is that their way of louring customers then the Supplier gets the blame. Also the 5 for R100 Colas as a special was not even on special two weeks ago.