Double debit penalty issue

So after Vodacom's mistake on biling their clients double for January 2016 they have decided to further penalise my account saying it is in arrears. This is because of their billing faults which incorrectly reflects on my account. Apparently now my account will also be suspended due to the account in arrears. Vodacom should take responsibility for their account mistakes and not penalise and inconvenience their customers.