Netgear nighthawk Cm3000

So I recently contacted cox ( spectrum) in hopes to upgrade my plan to 2gig since I seen they are now offering unlimited data plans. While speaking to someone in tech support they said that my Netgear cm3000 is not compatible for their 2 gig plans. Has anyone else had this issue, i have done some research and it shows this device is capable of 2.5g.