MBD - CONSULTANTS CONTINUOUSLY CALL WRONG NUMBER

This company has been calling me for 4 plus years asking for Mr Mashego. On each occasion i have told the consultant that I'm not Mashego and thru must please remove me number from their system. They sent me a sms with a link i should follow to add my identity number to remove my number from their system which i refuse to do, as I'm not on their system I the first place, they only have my number which is their incorrect number for the wrong person. They say their calls are recorded, then surly by now they should've picked up they have the wrong number. They persist and i am totally over their nagging.