Terrible Billing by Rain Internet

My payment date is set to the 1st of every month, yet Rain repeatedly attempts to deduct a payment every month on the 25th at 3am, before my salary is in the account. And then to make matters worse, they cut off my internet and say my account is in arrears. And the fighting I have to endure at home because of this is just not worth it. Try change the payment date and they tell you that it is already set to the 1st and unless you pay, they can't do anything. Can't change it on the app, can't change it via the call centre. No help, no options. Their internet is good, but the service sucks.