Worst customer service ever

My monthly automatic digital subscription payment to a US newspaper has been declined four days in a row on my credit card. I have contacted Discovery Bank via telephone (the only option) on three occasions. The first time, after explaining the issue, I was left on hold for over ten minutes and then cut off. On two further occasions I told the agent that the transaction was legitimate and that it must please be authorized. I received an email explaining that there was a system failure on a specific day and I should try again. That was a lie as the transaction has been declined on each of four days. None of the agents knew why the transaction had been declined and had to refer it to a different department. The last agent said she would escalate the problem. However, the transaction continues to be declined. So no luck getting the call centre to sort out a simple case of a legitimate transaction being declined, and clearly a waste of time spending more air time complaining through the only channel available. Discovery Bank has by far the worst customer service I have ever experienced from a bank and this is just the most recent bad experience. They are all bells and whistles yet light on the basics. That’s the opposite of what a bank should be.