Directv They took money from my account without autorization. newark, New Jersey

i worked for mastec wich is a company that installs directv and i got free directv sevice till i worked for mastec.  so when i stop working for them i continued my service. several months later i lost my job and my bill was 117$ ,they send me a box to return my receivers and so i did. one  day shortly after that my bank account was withdrawn for 245$  and when  i called the bank to tell them that i did not autorize directv to take thouse money they told me to call directv and so i did .they said i had agreement with them and there is nothing they can do-the fact is i never signed any agreement with them becouse i was working with them and thats how i got it for free when i started working for them,i did have to file a form to get it for free but they just wanted my name ,wok number and adress there was no agreement .so they insisted that when i continued the service after that i gave them verbal agreement which i might off but i did not have automated payments and i did not autorize them to take money from my account without permision.