Capitol One Were overpaid on loan and stole money from bank account Salt Lake City, Utah

I had repair work done on my plumbing. I couldn't afford to pay for it upfront so they offered me financing through CapitolOne. I refused it at first because of their reputation, but American Express refused to let me  put the price on extended payment all of a sudden and my back turned down my request for a loan. I put part of the payment on my credit card and made arrangements to pay. The interest was suppose to be zero if you finished paying off the loan in one year. First of all, they refused to send me any statements. I couldn't get anyone on the phone to help me and my letter for statements were ignored. But everytime I paid them I got a letter stating I would be receiving statements shortly. After I reported them to the Comptroller of Currency, I got letters saying I would receive a statement in February. My sister gave me a check of $1,000 to help me pay the loan off. I sent it to them by postal with certifications required so someone would sign for it.