Sheet street online

I'm really disappointed with the customer service and online service at sheet street. I've had an account with them for the past 6 years or so and always place an order online. Since last week when I place an order I get the transaction declined and the amount charged to my account. I've tried to contact your customer service and have been debited but they haven't solved or told me why I'm getting the transaction declined and your team have done nothing to help. They ask silly questions and then I don't hear from them again.