Reversing unauthorized debit order

I have been trying to get hold of them on all their telephones since yesterday, I emailed and still no one called me back. I even went on to Twitter to ask for a simple call back because when I call their busy due to covid. What is wrong with calling back your customer or why not do your work by answering when your customers are trying to reach you. I have debit orders unauthorized that I need to reverse and stop as when I contact the company they ignore my request, I can reverse on the app and there are no people employed to answer Tyme Bank's line. If there is anyone who is getting paid to do customer service for Tyme bank please urgently call me .