Cancelled service before new period of performance do I pay the monthly charge?

Cancelled service before new period of performance do I pay the monthly charge?  Cancelled September 11, 2020 before the new Period of Performance of September 15, 2020 through October 14, 2020.  Do I pay the invoice at the end of the month?  That invoice covers the 09/15/20 through 10/14/20 period.