Disgusting service and breach of contract

Shocking service. Why am I charged by my bank for a returned debit order that CellC tried to action before the contracted monthly date during December 2022 because of holidays. I am dumb founded by your reasoning. You are supposed to be a service provider. When did it become my responsibility to release payment to you earlier than my contracted date because you dont want to pay staff overtime on holidays. As if that was not cheeky enough you now charge me an extra R70 on my CellC account for the returned debit fee you auctioned *******ly. And then the cherry on top, when I call your customer service to resolve the matter I get told I need to send you proof of the bank transaction as well a copy of my CellC bill with the extra charge. Get you act together. I am losing my patience.