Unknown Netgear IP address on network (CG3000V2)

Optus has sent me like 4 Cg3000v2 on Fing there is an unknown ip. Along with the name netgear. When I scan the ports it is using it is using telnet. The router Optus gives everyone should be illegal. It has more security flaws in it then anything. An Optus refused to disable telnet.. If you did guess it I am hacked, not just any hack BLACK HAT HACKER aka cracker, it literally couldn't be any worse. An all Optus does is send out there useless routers that doesn't help at all. So if anyone knows how to completely remove telnet I'd appreciate it. I've only been with Optus for about 4 months now. An what I no is they don't care about people's security an there router exploites which was also an artical last year in the age making Optus router look bad yet they still give the router to everyone. By looking at the Fing app everything seems sweet bout there is nothing sweet about opened ports because of a useless router & getting hacked! As long as Optus gets paid that's all that matters right =) grr