Penalty for what?

On the 12/11/21 I bought a home lte on Black Friday promo. Call in to activate the sim, all security questions were asked including debit order date and with which institution. On 18/11/21 the debit order of R129 was returned incurring bank charges of R115. Thereafter I received text that I owe Vodacom a penalty fee of R108, despite having paid the account within 3 days. My issue is why am I being penalised for something I was not advised on.