I bought my own modem and router in February (from Amazon) and returned the Comcast equipment. My internet has been working perfectly. Today I noticed I am still being charged $13.00 a month for the Comcast modem. I called customer service and they claim their modem is still active and I have to call them back with the CMAC number of my equipment. How in the heck can a modem that I completely disconnected in February still be active?!!! It's not in my house or any where near it. And why is my service working just fine if that's the case?