The key to the answer posed by this question is to find out exactly what you and Directv agreed would happen in this situation. That answer will be found in the contract. There could be a term in the contract that does give Directv your "permission" to take money out of your checking account; there could also be a term in the contract that prevents you from withdrawing your "permission" in some circumstances.
Of course no attorney can give complete, accurate, detailed advice on a contract without reviewing it. Best wishes.
I am happy to give my "answer" to this question, but please understand that my posting does not mean that you have hired me as your lawyer. Even though I am a real lawyer with a current Nevada law license, I have given my input on this legal question for general information only.