Home Connect has deducted fee

We have been using home-connect as our primary wifi connection for our household for over a year. Every month, the debit order goes off on the 1st. For some reason July's debit order bounced and we were threatened with a R108-00 penalty fee. It makes no sense since there was sufficient funds in the account and now our wifi is suspended. You cant go to the website to file an official complaint based on the fact and query the penalty fee when there is no grounds to do so. I would like to get to the bottom of this.