Capital One Credit Card Complaint

Capital One Credit card department,

Billing disputes Colorado

On -/-/2016 I purchased an airplane ticket for the amount of $1900.00 with my CapitalOne credit card. In - of 2016, I disputed $500.00, but the amount actually debited back to the merchant was $1900.00. The merchant contacted me immediately, and I explained that this should not happen, but they did send me a copy of the invoice sent from CapitalOne, which shows $1900.00. I asked the credit card company multiple times to tell me what it was debited to the merchant and how it can be resolved, but they were not willing to provide me with the actual information. After the merchant threatened to report this to a collection company, because the case was resolved on my behalf for the amount of $1900.00, I paid the merchant again the amount of $1900.00. I asked multiple times CapitalOne to credit me the remaining of the amount of which they debited the merchant $1400.00 ( $1900.00 - $500.00 ), but they refuse to do that. I am losing faith in receiving this amount ( $1400.00 ), and that is why I am turning to the Consumer Financial Protection Bureau.