Should you have a dispute or have made an invoice payment you feel is not the correct amount, please call customer service at 800-600-1760 within 30 days of invoice payment date. If it’s determined there was an error in the amount of your invoice payment, your payment will be credited within five (5) business days. All refunds will be processed using the original source of payment. Credit card payments will be refunded to the credit card used. Cash or check payments will be refunded by check.