Account paid in full, but they still hasssling me

I usually transfer money to the account where my debit orders runs from. For some stupid reason I forgot to do this at the end of March and was one day late. <br> My debit order did not go through at the end of March, but I phoned Autopage and they manually took a payment out of my account for the amount of R1947.60 on the 7th of the April.<br> Subsequent to that my phone was disconnected a few times, and they are still hassling me for the payment.<br> And they keep threatening me that they are going to disconnect my phone, if I don't pay.<br> Everybody I speak to has a don't care attitude.<br> <br> Here is link to my credit card statement where the payment went through to Autopage.<br> [URL Removed]<br>