Triple Play Package

I would like to keep my existing plan but with a lower price. My bill has increased another $25.00 since the last bill. I am now paying over $290.00 a month for this service. Comcast always has special rates for new customers so how can I get my current Triple Play Plan at a lower price and keep the same plan (change nothing). I was told by an agent on the phone when I called that the current plan, I have is a Grandfathered plan. I do not want to change anything on my current plan just want to lower my bill if possible.