poor service

I ordered a laptop online, and I received SMS to say it has been approved. I have 6 contract with Vodacom already .I have been waiting for delivery for the past 2 days . I contact them to follow-up as no one is contacting me. I then discovered that my order have been cancelled and no one can tell me of the reason. I am being taken from pillar to post. This is the second time this is happening.my first order was on the 22 December, the same thing happened ,I had to call in to find out what's happening and was advised that my order was cancelled and again this week. what really irritates me is that Vodacom do see the needs to contact me and tell me that my order is cancelled. if you cant assist me let me know so that I can buy from another service provider please.