Paying more on a Fixed Contract

<p>Bought a new phone and I desided on the Promo Special back in December 2016 LG V20+LG 360Cam for R580pm that includes a R199 uchoose plan</p> <p>I signed the form and it clerk told me that my monthly payment will be R580pm...</p> <p>Now just got a mail/sms from my bank saying that i payed R768.49 and the invoice system on Vodacom is so unrealiable that it says my next payment is going to be again R768.49</p> <p>Why am i paying so much more if the product is R580pm</p> <p>This is unacceptable </p> <p>The 1st month i was debited with +-R1200... WHY???</p> <p>Im so close to walk into a Vodacom shop give my phone back to them and request for an immediate Cancelation if this issue is not going to get resolved</p> <p>Very Disappointing!!!!</p>