Since joining

Since joining Lebara I have been plagued with spam phone calls. Has anyone else experienced this problem? How do you stop it?

Seems fine to me you can on most phones block unknown numbers

Thanks for replying so quickly. I know about that. My problem is I am getting calls from unknown numbers about work so I cannot afford to block
unknown numbers. I was wondering had anyone else experienced the same thing. My brother and sister in law both switched to Lebara on my recommendation and have not had the same problem. Seems I am just unlucky