Upgraded to Gigabit x2 Plan but only getting 40Mbps upload speeds.

Hello, I upgraded my plan to the Gigabit x2 plan but I do not get faster upload speeds and am still limited to 40Mbps. I've rebooted my modem 3 times and I can see that only 4 of the 8 upstream bonded channels are locked. Can you help me activate my expected 300Mps download speeds? I'm attaching a screenshot from my cable modem.