I found out my bill for 2 HDDVRs, internet and free HBO next month was $100 rather than $85, which it had been. They said that was because I only got a half discount next month because it expires halfway through June.
Without any threatening or arguing whatsoever he offered to give me
another discount, which would make my bill $89 instead of $85 and extend
through October. I took it, and deleted the sports package, which is $8
a month but was free until halfway through next month. I only need that
for the NFL Network, so I won't re-subscribe to it until September.
So now my bill will be $81 and I have HBO until August, when the
promotion will expire. At which point I'll call and complain that I was
told it would last until October with my discounts, so they'll respond
by giving it to me for free at least until then.
The key is not in your manner, but just getting on the phone with
someone who feels like giving out discounts. Usually that's the
cancellation retention dude, but today it was just a regular operator.