Barclays Credit Card Complaint

Barclays Credit card department,

Billing disputes Tennessee

I have received a duplicate charge on my - - Credit Card. Barclay card has submitted me documents pertaining to the charge. I filled out all valid info and wrote detailed info as to why it was duplicated. I also showed what card they processed the refund on my contract. Barclay is telling me that they received my fax after the allowable time and will not process my dispute. They charged it back to my card and accrued higher interest adding to extra income on their side. I do not believe this is within the guidelines that a credit card company is suppose to act. I received the - letter and submitted the documents via fax two days later. They advised it was after the 5 day period and ca n't process the dispute.