I can think of two ways to handle this that minimize your wasted time:
1. Call in and record the idiocy. I use Skype and a headset, so I can get work done while on hold. When the rep answers and asks "Who am I speaking to?", say "This is so and so on a recorded line.", just like your stockbroker, etc. does. If their standard blurb says they "may" be recording the call for "training and quality control", then you don't have to announce anything, as the call is now recordable by either party. Collect and post these idiotic exchanges, audio and transcripts. Shame and name.
2. Bypass the call center. Look up the registered agent of the corporation in your state. Send them a very threatening letter, return receipt requested, stating the facts and your demand for whatever they are doing to stop. Give them a time limit to stop, and then threaten to sue them in small claims court. There are these standard letters all over the net. Note: whether you actually sue them eventually is beside the point, and entirely optional. Trust me, an actual lawyer will have to respond to your letter, and it will be very expensive for them. You are also on record for any future court actions, and they know that. The letter templates are easily found with google, your state secretary of state may charge a dollar or two for the address of the registered agent, and certified return receipt costs about $6. Cost on their end, probably $200 to start in attorney's time. Much easier than hanging on the phone and being served by idiots.