Poor service!

My mum had went to Dis-Chem twice at Newcastle Corner to purchase 2 packs of 3 Airmune. But, as usual they didn't have stock, we were told to come back when stock comes in but instead of wasting our time and petrol we called the shop to find out if they received stock then an employee by the name of Debris or something like that he said his name was, took down our details and entered it into their system and said we will be contacted when stock comes in and our order will be kept aside! We waited for a week and still nothing came through. So we decided to go back to the shop to find out what's going on, we went to the shelf and there was nothing there, again! Then another employee by the name of Shantel assisted us, she looked for the products because we said to her it was kept aside! I waited about 35-40 minutes in the shop, the product could not be found! We were then told my details is on the system, as soon as their stock comes in they will deliver it to my house free of charge! Another week has gone by and I still haven't received anything!