incorrect billing

Hi took two contract phone online with vodacom. P30,they advised my installment will be R499 .Debit order will go off the last day of each month to my suprise vodacom decided to debit on the 25th and i did not have funds on my account therefore was charged for two unpaid as they deducted twice.When i took the deal the consultant that was assisting me advised easch phone will get airtime of r130 and 20 gig data.but all that was a huge lie. i have called vodacom help line they taking frm pillar to post.the vodacom number that i have been calling to get assistance is ***