Online sales (CAD Online) will approve you then cancele your order

Yesterday I app**** for a cell phone contract online and was asked to send through my Payslip and My ID as supporting documents for my application. I did that immediately and by the afternoon I received the below feedback.

Your application has been approved, kindly contact Vodacom Direct-Activations on *** to assist with activation and delivery.

Now its the following day I called in as per above and was told my application delivery was canceled.

Why was it cancelled this is really frustrating.