Why am I unable to adjust my plan?

I am unable to adjust my plan. I know that it will only take effect in the next billing cycle, but when I follow the steps of manage -> adjust plan -> change plan, I get an error message at the top of the screen in red of: "Billing cycle is invalid".
I would like to adjust my plan so that it is different for next month, but this is preventing me from doing so.


This discussion has been closed.