Vodacom AGAIN overcharging me !!! Every month a problem

Vodacom AGAIN overcharging me !!!

In Augist I changed my debit order to go off on the 7th of each month... 7th Sept came deducting my bank account for double the amount I am supposed to pay R 1615.98 (R807.99) normal amount ,without them informing me when I changed the debit order date that the amount for 2 months will be taken and not just one cos of the debit order date so amount of R1615.98 could not go off from my account cos I left the amount which they were supposed to take so I phoned and asked why are they debiting that amount so they said it's for 2 months so I said to the lady please then rather dont change the debit order date keep it the same ... I then arranged for them to take the amount of R807.99 on the 10th of September which then went off by debit order successfully on the 10th September .. October came amount of R908.87 got deducted I then had a penalty fee of R100 so I explained to them the situation and they then credited me R100.00 so for November I was then to be debited for the amount of R708 i got debited for the amount of R1515.10 instead of R708 ... Every month I have to enquire about what is going on with the amounts being debited from my account and I have to take responsibility and pay for all the fees ..

VODACOM PLEASE RESOLVE THIS MATTER ,as a customer I am tired of having these issues every month