Capital One Credit Card Complaint

Capital One Credit card department,

Credit line increase/decrease Montana

I rented a car from - and they asked me for a credit card ( Capital One Card ) to place a " hold '' on until I returned the car. At the time of return, I had been told I could pay in cash but they ( - ) said they would not accept cash so I gave them a different card ( - - ) because the amount was over my limit on the Capitol One card. I advised the merchant not to charge my Capitol One card and the representative agreed. I left the car rental company thinking everything was taking care of until I checked on my Capital One card and it had been charged for the car rental and was well over my limit which I did not agreed to and I did not authorize. I disputed the charges.