Form submission not going through

I have a customer who said they have tried to submit a form three times and keeps getting an error message when she hits the submit button.

I have attached a screen shot which was sent to me.

I apologies for the inconvenience. Yesterday and today we faced some technical issues. And probably because of that your user was unable to submit the form. It was a temporary issue, and already fixed. So now your user will not face such type of issue, for new form submissions.

If you have any query or need further assistance, feel free to revert back. Thanks