Terrible Customer Service

We went to the above retailer about 2-3 months ago(on a Saturday) to do our usual weekly shopping. My fiance saw some Dr.Pepper, and as it's quite difficult to find, we took all they had (19 tins at R16-99 each), and then we also asked for the manager to find out when they'll get more. We were informed they only get it in when someone orders, we asked to please order us a case, they took our details down to let us know the Monday when it'll be there. We are still waiting for them to contact us, every time we ask about it, we're told they haven't received it yet, and they'll contact us. On Thursday my fiance happened to go there to get a few things, and wasn't he extremely surprised to notice them unpacking Dr.Pepper?! And no, we still haven't received our phone call to collect it. Is this really how you treat your customers? Oh yeah, and I logged a complaint on the website on Thursday, and haven't received a reply on that either.