I want to upgrade to Gig internet, my modem is DOCSIS 3.1 and supports gig. I do not want to change my TV service and I do not want a phone, only upgrade my internet. I have contacted Xfinity twice and both times aI have been told this is not possible. If I can't upgrade to gig internet I will look elsewhere. Is there anyone at Xfinity that can upgrade my internet service without telling me I need to change evertything?