Not cancelled our line.- now blacklisted.

First, we tried to port our number from Telkom to Vobi, to which Telkom did not respond to Vobi's request, instead of fighting we then cancelled our number last year February. I got the emails and cancellation confirmation that they have received the email of cancellation, to our horror they not only not cancelled our line which we have not used in over a year, but they have also blacklisted us. I want our name off the blacklisting.