Barclays Credit Card Complaint

Barclays Credit card department,

Billing disputes Washington

In - of 2015 I had a large charge of $2400.00. from a vendor who I contacted to get a refund in -. Since the charge was on my - Barclaycard statement, I contacted their dispute department regarding this charge which they said do not pay until dispute is resolved.- statement reflected no credit. Then - received a letter from Barclaycard 's dispute dept that $2400.00. credit was issued twice therefore I owe them this money. My previous bill was $520.00. now amount due by - of - is $4600.00. My complaint is I think Barclays mishandled the funds in order to make a very large amount due so they could collect 25 % interest which I believe is grossly unfair when charges should have just cancelled out. Now they make it impossible for me to pay this huge amount in full and they gouge me for - & interest on the balance.