Billing issues

I want a head supervisor to call me asap I have delt  with 3 reps and a supervisor and have gotten no where someone needs to call me or I am canceling my service with you that I’ve had for the last three years and I will make sure that no one else that I know or anyone else that I can talk to will never have your services and if I have to take all my paperwork, go to my bank pull all my records  from four years ago I will do that . I have all my bills in front of me I see what’s going on and you have not posted my payments to my account and your billing me for payments that you’re not supposed to be billing before I am not late. I am not behind in my payments and the amount that you’re billing me are wrong so if I have to go into the store and go to the bank and take all my paperwork in to deal with this it’s not gonna be pretty. I want a head supervisor of this department to contact me immediately. Thank you