New vs existing customer

I have been an Xfinity customer for 27 years and never missed a payment. I am leaving Xfinity, not because of the service, but because of cost. If I were a new customer, I could get the same service at less than half the price locked for five years. Because I’m an existing diamond level Customer I get nothing.

What is the logic behind letting a loyal Customer walk out the door to be replaced by someone who may or may not even pay their bills?  I have spoken to your online representatives and their only solution is to cut Service to get a more cost-effective bill. 

what are they thinking??