I'm not who they're looking for

I'm so annoyed, I get about 3/4 calls everyday from these people looking for a Tembisa Precious, I've been telling them I am not that person I don't know how they got my number mixed up with this person's. I've been telling them to remove my number from their database but it's not happening.I feel Harrassed.I've blocked so many of their numbers but they call with a different number everyday.