Telkom is the worst

I am mortified by Telkom's manner of doing business. I have a router from them where i paid R138 monthly, they increased the premium without letting me know to R140, which i was fine with.

Today they debited R344 and when i called in, a lady by the name of Zimasa Mngceke told me that the R204 fee was a result of an unsuccessful debit order from last month. Whose fault is that? I get paid on the 25th of each month, telkom tried to debit on the 24th, ofcourse they wouldnt get the money, thats not our agreement.

And now they somehow cannot help me close the account over the phone?