Can't add Unlimited Data

Have been trying for a few days to add the unlimited option to my internet. When I tried chat they stated it was $50 per month even when I pointed them to the offical Comcast site stating it was now $30 per month. When I try to add online I only get to adding and then an error message of unavailable at this time...

I think it is ricidcous that Comcast "gives" it users 1225 GB....with my still working ftom home and my kids doing online schooling I run just under 2TB per month....I can only imagine what a "heavy" user goes through. At least At&t extended till Sept 30.......

But alas I digress and need to add the service - so perhaps a little help here.......