See Mis-Use of Card . If you have problems talking to the representative on the phone, ask for a manager or supervisor. Your Purchasing Agent is available for assistance. If you are expecting a credit, tell them from what vendor and for how much, within no more than 3 calendar days of talking to the vendor. This process should be used as a last resort.
Most vendors do a really good job of responding to the informal dispute process.
The bank requires an original signature on the form. The address is on the form.