Debit order bounced

For some reason my contract debit order bounced. There was enough money in my account, but that is besides the point. Vodacom did not notify me it bounced. This had a very negative affect on my credit score, as it shows I paid 30 days late. I tried to ask Vodacom social media for help, but after a week of excuses they say that I must ask my bank why it bounced. My issue is, why didn't Vodacom send an sms or email to notify me? It is just R49, could have made payment via alternative method if needed. My credit score dropped by 20 points because of this issue. The worst part is it took nearly 6 months just to get Vodacom to submit the payment history to credit bureaus to begin with. The contract is really just a waste.