NO assistance with cancelling a inactive sim since 2020

NO assistance in cancelling one sim card since 2020! We opened a sim card in 2016 and canceled the contract after the 4 years. And we were told they cancelled the subscription. In 2021 we tried to cancel the subscription again after we got a invoice for R1061 and gave us over to Nudept . We paid this and after it was paid, we have been in branches multiple times, called multiple times, emailed multiple times, even emailed complaints at MTN to cancel this sim card (that is not even active anymore for year). We have been told multiple times they have now canceled it but never do. and most times dot get any response or assistance from MTN or Nudept to get this cancelled. This weekend a amount of R560 was taken from our account for MTN, So still this is not cancelled. So since 2020 no one can assist cancelling this sim. one tells us go to nudept and one tells us no go to MTN. We even got a letter from MTN that we don't owe anything. And then still no response from nudept as well after sending that. We went to 2 branches for MTN this weekend to get this cancelled but yes once again with no luck.