Cablevision Unauthorized ACH Debit Fee Stratford, Connecticut

Back on June 12,of 2012 I made a payment to Cablevision like I always do on line in the amount of $20.00 for some weird reason a notice popped up on my screen saying that a payment had been made and if I wanted to make another payment. I had never seen this before so I didn't click and I called cablevisoin to ask them if my payment had gone though and I was informed that it had not so I clicked the button and the payment when though.  I was checked my checking statement about a week after that and I see that $20.00 plus $5.00 totaling $25.00 had been taken from my account and for a ACH fee. I wanted to know what this was for and I called MUC they first told me that they didn't know what it was for then later told me that Cablevision tried to get a payment from my account of cause I called cablevision and they said that it did not come from them. I then when back to my bank and they gave me a print out but all that it say is Westchester,westchester what they are both giving me the run around and my money is missing. I have talked to cablevision and they was not helpful at all they said that my account didn't have enough funds and the bank charged me that fee but I informed her that my payment was made on June 12, not June 18, so who authorized that June 18,2012 payment not me. I had the funds in my account on the 12th so on the 18th the funds was not in my account so I would not authorized a payment with no funds in my account. So, I am out of $25.00 and no ones can tell me who took the money.