make billing by the monthly calendar not 30 days !
why not make billing my the montly calendar as the way you bill now on every 30 days
this would fix your monthy bill to a fixed day as apposed to changing the billing due date every month
I remeber the land line telus did it that way as my bill was always due on the 5 of every month
much more simple far less confusing
but land lines are becoming a thing of the past as is simple billing i cancelled my land line 10 year ago
but still remember the simple billig date