Paying premium for a phone that I have not even opened

I have done an upgrade ONLINE on 4 June 2018 on my existing contract with Vodacom to the Samsung A8 Orchid Gray. When I received the parcel today 5 June from RAM I got a Tax invoice R1157.30 Invoice nr: K ********** with the parcel that I am being billed for on 2 July 2018 with my existing premium of R472. Which is total R1630. I am very irritable that I am being billed and not even the Vodacom contact Centre can Advise me for what this R1157.30 is on the new phone.. I have been a customer of Vodacom for a few years now and This is by far the worst experience I have had when it came to upgrading my phone.. Never have I paid double premium when I upgraded in-store. The T&C's states the migration will only happen on the first day of the next calender month and then I will move over to the new Contract. I WILL NOT PAY for something I have not used.. I would appreciate it that my contract debit order be rectified ASAP.