Deduction date changed without my consent , invoice sent via email and sms sent differ

I called Telkom explaining my dissatisfaction several times only to be given an email address that is undeliverable as it is full. Called to explain the situation only to be given same email address. But they know they are not going to receive the email. *** Email Complaint reads: GOn the 25 of March 2022 the premium Was never deducted by Telkom as they normally do /as per our agreement monthly upon seeing this I paid R393 on the 29 March 2022 because I didn't understand why they did not deduct on the 25

On the 22 of April 2022 I received an invoice with an amount of R333.40 but then again on the 25 April money was not deducted. And on the 28th April I received an sms not invoice alerting me they will deduct R622.57

I called Telkom and asked them why different amounts and why they did not deduct on the 25th I was told deduction date was changed month end .and I missed payment last month then I was charged 200 and some money for back out

1. Why was deduction date changed by who ?I have never changed deduction date and you can see with my previous invoices money has never been deducted on last day of the month . I paid on the 29th March upon seeing no money was deducted on 25th. Why am I paying back out fee .when I only I did is to pay seeing it was not deducted

Attached statement showing that on the 25 March and 25 April I had money on my account. And paid on the 29th seeing no deduction

2.invoice sent to me on the 22 April 2022 3.sms sent on the 28th

.deduction changed back to the 25 by Zintle telkom call center

Please reverse the back out fee this is a ******* how can you just change dates just to get these backout fees from customers