Failure to debit account and sending suspension emails

I joined Herotel fibre towards the end of August 2022. I Opted for my account to be debited on the 1st of every month. 1st debit was supposed to go off on the 1st October 2022 but never did. I have kept the money in my account just patiently waiting for Herotel to debit my account for August 2022 and September 2022. Today 10 October 2022 i receive and email for payment for August, September and October 2022. How can they demand payment for October 2022 if the month of October has not ended. And they demand payment after they were supposed to debit my account. I never agreed to paying the money into their account. They need to fix this issue and they cannot demand payment for October they need to debit on the 1st of every month for the previous month.