Agents terrorise us daily - incorrect numbers on Capitec system.

We receive numerous calls from Capitec agents on a daily basis and they are looking for IPP Mining, to confirm employment. IPP Mining number is ***. our Avis number is ***. We constantly tell them that we are not IPP Mining, we are Avis. They insist that the number on their system is correct. Please advise where do your agents get their contact numbers from? Who is responsible for this, and who can I contact to rectify the incorrect number? As this is becoming very bothersome at my office ,as we receive call after call from Capitec, and this is unnecessary and bothersome.