Poor Vodacom: Existing customer order canceled with no reason

Aaaaah Vodacom with poor service and treating customers badly! I ordered a contract phone on 24 Nov 2017 using the online service and received a new deal order reference number on my email. The week passed with no communication, so I decided to make a follow up on my order by contacting the Vodacom on 1 Dec 2017. To my surprise I was told, they could not find any reference to my deal order. The agent then assisted me to make a new order on 1 Dec 2017 and confirmed everything (banking details and delivery address). Another week passed with no delivery or them deducting the money on my account, I decided to make another follow up as of 13 Dec 2017. The agent told me, my order was canceled, but she cannot see the reasons for cancellation and the agent promised to escalate the matter. I was also informed the deal I ordered the pricing has changed. By the way, I have an existing contract and prepaid number with you Vodacom, so I wonder why they are doing this to me! I need answers for cancelling my order without informing me.