Another customer service tip: if you don't like what one custmer service person says, try another one. It doesn't really matter that much if the new person you talk to is a "manager"--I'd say that a hefty percentage of people who ask for a manager get another customer service rep who pretends to be a manager.

If calling, I would call back at a separate time and talk to someone else. Maybe they will be more enlightened. Maybe you will have your arguments organized better.

I think that tenaciously arguing with one person and fighting a single campaign is a mistake. You may be identified as a problem customer from the start and maintain that identification as you continue. The challenge for management might become to stand up to this unreasonable customer.

It's better to try to find someone more enlightened or in a better mood or with whom you hit it off better.

Then, if that doesn't work, you can go ahead with the feistier recommendations made above. But the odds are, you won't have to.