I called Sonic's customer service about the change and if we could get upgraded to the faster speed since we're paying the same rate. The service rep unfortunately said that wasn't possible due to some limitation enforced by AT&T. The only solution she could offer was to disconnect or current service and sign us up for new service, which would result in a 2-3 week lapse in having service. The rep was friendly, and I totally get that she could not do anything here.
This does feel quite disappointing though. Is there really no way to directly upgrade here? Especially with the pandemic, it's getting harder to justify paying a higher rate for a lower speed.