My contract ended in August and i called in July to cancel the Smart-L Line rental and renewed to Monthly Voice Bundle

My contract ended in August and i called in July to cancel the Smart-L Line rental and renewed to Monthly Voice Bundle. The cancelation was confirmed by the Call Center agent and the Retention department. And i am surprised now in September the canceled line is still running and they are billing me for it. What was the point of spending hours on the phone to confirm the cancelation if nothing has been done? I need this reversed ASAP. I am even thinking of canceling this new renewal and migrate my line to Mtn. Your service is pathetic.