Advertised goods out of stock

I app**** for a Telkom mobile contract in the store. it was approved but for 2 weeks I kept inquiring and they kept saying they didn't receive stock. 2 weeks later they said never going to get the stock for my contract so they said I can cancel the application or take out another one. I was upset and told them to cancel it. Only to realise that the law states that if a product is advertised the company is obliged to give you an equivalent or better product, which obviously Telkom store didn't offer me. They just told me to apply for something else after going through the whole motion and getting it approved. They made me wait 2 weeks and just told me sorry we cant get the phone you want even though the same contract with the same phone is advertised again in the February issue.