Debit order date!!!

<br> About a month ago I went to Flamwood Walk Klerksdorp to upgrade my phone and my husbands Phone so i asked the lady to change my Debit order to the 10th of each month because my pay date is now on the 10th of the Month. So end of last month I received a call that my account is in arrears. I went again to the shop and I ask the people to change my Debit order so the new lady told me the date that was on the computer incorrect. So last month I made a cash payment off R1900. I phoned again the call centre and ask if my account will be fine now because we arranged that they will deducted R2400 this month because off the upgrade. was I not Surprise that I received a call this morning that they will turn off my phone because they didn't received a payment. I don't know how many times i need to go to the shop before anything will be done??? I just want the people to use my Debit order like we arranged it????<br>