HOLDING MONEY ON CREDIT CARD MORE THAN 11 DAYS

I will never rent a car there again. It's more than 11days and still they are holding an amount on my credit card. I have emailed them but without success. They make excuses every time. No one helps to resolve this problem. They are also trying to take an amount from my credit card and I don't what it is for. No one gives me any feedback or an Invoice. This is very bad service.