Dischem Huggies hold ****

Hi there, Dischem recently advertised a special for their Huggies gold nappies online. The nappies were R179 a pack however when you get the to payments page it told you that you further qualified for a deal and you ended up getting 2x packs for R179. I bought 4x packs for R359 The order went through successfully and I received my order confirmation. Today Dischem sent an email claiming that the promotion was incorrect and that there was an error in their system and quoted their terms and conditions . Firstly I believe that regardless of the system error the moment my transaction went through for what was advertised the deal between Dischem and I completed when they accepted my payment. Secondly, some customers received their orders for the very same special at these exact prices so clearly Dischem is in breach of their on terms and conditions the moment they processed those orders this is total ************** from them to us. I do not wish to get any refund I would like to receive the nappies that I paid for. I’ve sent them an email and hoping to receive the nappies I bought rather then a refund I do not want that can take up to 7/10 to receive.