CM1000 telephone

I ran into this problem.  My previous rental modem from comcast had a phone jack along with router but was 5 years old (horrible wifi) and had never been connected to the phone. We  had a separate telephony modem in the basement that was connected to the phone line only.  I bought a CM1000 and hooked it up with a new nighthawk router.  Wifi was fantastic, but 3 days later realized my landlines were down.  The tech came out and said Comcast had deactivated BOTH of my modems and reactivated the account with only the new modem.  He said he would replace the Telephony modem in the basement with the one I was replacing as they did not support the telephony modem anymore (granted it was WORKING PERFECTLY before they deactivated it !!!).  I then questioned the tech if we would get the rental fee taken off of our bill.  He told us to call a service agent.  The service agent said we still had to rent the modem that is in the basement being used ONLY for phone service.  Needless to say I am angry (there was no need for them to deactivate the old telephony modem accept to tie me in to the rental fee.  Now looking to buy a second modem that has phone connection to replace the one in the basement.  May be cheaper for you to just buy one that has phone connection in the first place