Useless personnel

My top up contract expired end may this year. So I called the call centre and cancellations department numerous times to ensure that may would be my last debit order. I was told that there would be a note loaded on your system and my contract would end 31 may 2019. Then I receive a statement via email to say that R 711 would be debited in June. So then I called nour call centre again to find out why my contract was not ended and I didn't get an answer why but the lady was nice enough to do her job and terminate immediately. So now my number is prepaid, but today the debit order went off my account. So I ask why is the call centre so useless? Why should I call 5 times to ensure something happens and still it does not get done? I was told that if I used the data given then I would be billed for June. I can ensure you that I have not used the data or my sim card for that matter. Please assist and return the money that you took from my bank account. My new number is ********** 635