Billing Horror scqm

Every month if it's not me, it's my mother going through the worst with these people's billing. I regret taking out a contract with Telkom. In June I called and changed the payment date to the last day of the month, I asked them to change the bank account from capitec to fnb and also asked them to send me the invoices via email. Non of the things I asked was done. Today I check the invoice online they've added 200 rejection fee, I go to Facebook to enquire and I'm told the payment date is still on the 5th. They tried debiting on the 5th and it bounced. I'm very much unhappy because same thing with my mom when she took out the contract in 2019/2020 she asked them to debit on the last day of the month, she's a pensioner and gets paid on the last day of the month. They put the 5th as payment date and every second month she'd pay double plus the rejection fee. At this point I'm convinced that Telkom is a **** and use these rejection fees and wrong payment dates to make extra money.