Double amount deducted

I changed my debit order from 1st to the 8th of every month.

They infomed me it has been done with no problem.

I was not informed that double will go off.

When they tried to deduct the cash because it was double the debit order bounced which resulted in R100 being added to the bill.

Went in to vodacom and complained about that which they said is fixed and i paid the right amount cash.

And they informed me next month the debit order will go off with R100 rand added which i can despute as i was not informed.

On the 8th the debit order went off double again. Which resulted in a bounced debit order.

And R100 being added.

Now i must pay the full double amount and can only despute 1 x R100.

I am not happy with this. Its impossible to speak to the accounts department as they havr alot of things to say about why i must pay DOUBLE for changing debit order date with 7 days.

Not happy vodacom.