Bad service at Vodacom

I upgraded my tablet contract almost a month ago. but what I wanted to upgrade to they didn't have in stock and they waiting for delivery fair enough they said they should receive stock just before Christmas. I went there before Christmas no stock had arrived they then told me after Christmas before new years. after Christmas I had to phone and check they didn't phone me. once again no stock they should receive stock after new years. New years came and went and now im still waiting on the 6th of January for my laptop which I paid for almost a month ago. They push for sales but after that the service goes down the drain