Not sure if you want to go down this path or not but I am pretty sure activating a “growth” plan is automated. The last time I submitted the form to go to growth it was active in I think 15 minutes. If you hit data limits already maybe going to growth is unavoidable in the future anyhow.
With the 4th of July Holiday I’m guessing it’s a skeleton crew at Particle the remainder of this week. Good luck!