Your error is frustrating me

I went to a Telkom store in Fourways to change the account they debit from for my bill. The visit was in the first week of May and the lady that assisted me advised me that the need a months notice so the amount being debited end of May will still come out from the account I’ve been having then after switch to the new and proceeded to take my account details. The debit for the bill was taken from the new account which I advised would not work yet which had no funds available so I’ve over drawn now.., anyway. I go to the same store and the same lady assists me again and tells me that “ sorry she didn’t know, the rules seem to have changed”. I let it slide and she advises me where I can go pay and says I must use my bill. The very same day which was the 01/06/2019 I go to checkers to pay the bill and it’s done. I am still receiving texts about an outstanding bill but now when I call the call Centre the automated machine advises me my outstanding bill is the one that’s only due at the end of June which is a total of R1098.55. No one seems to know what’s happening and I keep getting texts about this outstanding amount and it’s frustrating me. The call Centre girl at some point told me this total is being picked up as outstanding because the system is still reflecting my May bill as outstanding and my April bill and it’s added those 2 amounts together. Now that makes no sense because those 2 bills add up to more than R1600. I am confused more than ever and annoyed because I paid my bill after an error you made at my inconvenience and now it’s this!