Telkom poor customer service

I have a contract with telkom. On the 1st of August I didn't have money in my account so obviously there was a debit order rejection fee which is R200. On the 14/08 I received money and immediately Telkom debited R524 which is my monthly subscription plus the rejection fee. That's understandable. Come 01/09 I have money in my account and I expect them to debit the normal R239. They did not debit. Now they send me a statement that says I owe R510 for September 2021. From R239 plus R69 for out of data bundles which is R318 to R510. .....How come. I contacted them via Facebook they say my account was debited by nudebt on the 14th August so I have to pay manually. So skipping one month means every month you will pay debit order rejection fee .....Get your act together Telkom please