Unable to blacklist

Good day, I got in touch with Vodacom on the 21st of January to blacklist a specific headset that was ******. <br> I received a reply back today stating 'Good day please note cell number *** its not a Vodacom number, please blacklist this unit with the network it was using Kind Regards, Vodacom Customer Care Vuyiswa Mnguni'<br> First of all this is a Vodacom number and it was ported, second of all I have already spoken to MTN who advised they are unable to assist as the number resides with Vodacom.<br> Please assist