Poor customer service and billing Vodacom

I upgraded my contract in January 2018, when I saw my statement at the end of this month I see that I have been charged twice for line rental? This cannot be right.

In addition the debit order that went off is different from my invoice value. My invoice value with the double line rental was R3491.23 and Vodacom debited by account with R3690 These don't correspond at all The R3491.23 is the final value I can see on my statement so where the hell do they find the additional charge from, the almost R200 is not listed on my invoice? Should this not be disclosed to the customer?

Please can I urgently get a refund to my bank account and not credited to my Vodacom account as I am concerned should I be credited that the same will happen and the credit will be missed. In addition a refund to my bank account cannot take a month to process.