Double payment has gone off

A double payment has gone off. I have emailed multiple times in the last 2 weeks, but there has been no response. Have sent emails with my banking statement to show it's gone off twice, but there has been no response back from them. They have no telephone line. It tells you to go to their website to chat with their chatbot or email and then cuts off! But there isn't even an option to do so on their website. Just their email address for support which means nothing!