incomplete order

It's been about two weeks since I have placed an online order at mr price and today, finally, I received the order after having to check myself whether it had been delivered. On collecting the order I was informed that the order had not been booked in even though the tracking number said it had been delivered on friday already. To top it off the order is incomplete with one item having been on hold for the last 2 weeks and without any explanation of the problem. This item has been paid for in full and I am left uncertain as to whether I am ever to receive it. I am really disappointed with how this order has been handled. I will be thinking twice before buying online again.