I received a flyer in the mail from Charter Communications Offering 6 free months of Showtime for free as a gift for being a "Valued Customer"
I called 1-877-958-7171 and mentioned the flyer and they added 6 months of Showtime for free. I am in California, I don't know if it works elsewhere.

Thank YOU!

I just cancelled Showtime, HBO, Starz, Cinemax, etc... with Charter two days ago in my local office - Southern Oregon. They said 'No current promotions available'. I wanted Showtime only and they said "$14 per mo...", to which I said 'No thank you!'

I just called the number you provided and said "My husband got a flyer in the mail (yes, I lied...) that said as a valued customer we are eligible to receive 6 months of Showtime for free." I also explained that I'd recently cancelled my Showtime and other premiums due to the expense and taken on Netflix instead. Within 30 seconds the rep had given me the promotion - no hassle - and told me that at the end of six months the Showtime would just stop working, and I would not be billed.

WOW... now I'm so happy because I'll be able to keep up with Californication and The Tudors! Thank you again... great deal!