US Fast Cash Deposited money in my account after I told them I was no longer interested, taking interest only payments every month. Internet

In August of this year I applied for a cash advance loan through US Fash Cash.  After getting all the details, and seeing on line that my application had been withdrawn and to call a certain number to get the details, I sent them an e-mail stating to just forget it, I no longer wanted the loan.  I found out later through checking my bank account on line that they deposited the money in my account anyway.  They have since been taking interest only payments amounting to $60.00.  This past month I made an additional $50.00 payment on the principal amount, which was $200.00.  Lately I have not been able to log into their website and came across this site claiming all the ripoffs being done by this company.  I don't know what to do to stop all these payments to them.  Can I contact my bank and have payments stopped?