Please assist with any information possible...
My wife and I applied for the renewal of our US Visa since October 2018 and we were told to come for a follow up interview under 221G. All attempts since the keep bringing up the below:

SQL Exception occured while Scheduling an interview. Please ensure that you have selected an available DateSystem.DmlException: Insert failed. First exception on row 0; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, A visa class is required when scheduling an appointment: []

I have called several times and sent several mails, but they keep telling me to check back and it has been escalated. It is 6 months already. ANY INFORMATION IS APPRECIATED

@Ebony84