Your website is *******

I have spent the ENTIRE morning trying to pay online for an order. I have used a credit card and my debit card. Both are either returning the message \Customer could not be authenticated\" or \"Oh dear! Your transaction has been declined\". I have called both banks and there is absolutely nothing wrong with my accounts. I enter all the correct details and one-time passwords. It's quite clear that your website is the problem! Absolutely appalling service in an age where everything runs online."