Discover Credit Card Complaint

Discover Credit card department,

Billing statement Minnesota

On -/-/15, I disputed an Incorrect Electronic Funds Transfer with Discover Card for Image Dental ( $600.00 ). Since this time only a temporary credit was issued and again the ( $600.00 ) appears on my account. I was told by Discover Card they do not offer permanent credit for Incorrect Fund Transfers. They only ask the Merchant to provide a credit to my account.