Hitron Cable Modem Update

I just redid my Xfinity triple play plan and one of the perks was my internet going from 1000 down / 40 up to 2100 down and 300 up. After the new plan took affect, I realized that my modem wasn't on the enhanced internet list. I bought a new modem that is listed on the enhanced modem list. Hitron CODA56. My speeds still have not changed and tech support has no idea what to do. I saw on here that others had similar issues and that an employee was able to send out a provisioned update. Could someone please help me here? Thank you!!