Bad Service delivery

I have been with Vodacom Fibre for the last 2 Years and 2 Months on a Contract and they are debitting my account every Month. My Account got behind with arrears and I paid them Cash with my Credit card R2516 and arrange an outstanding amount debit of R629 at end November which was agreed upon. On the 19th November my kids woke up to an Suspended fibre network not able to do their School projects, I want to know if this is fair and what can be done because this is humiliating and very bad Service. I need someone from Vodacom Fibre department to rectify this, for such a big company to not keeping their promise is rather disappointing and ridiculous.