MBD harassments

I have been harassed by these people for weeks now, they call me on a DAILY BASIS. They are looking for someone and EVERY SINGLE TIME I tell them that I am not that person. I know who they are looking for, I have shared that person's numbers with them and asked them to remove mine from their system.

But time and time again they keep calling me, I have even sent them an email with the details of the person they are looking for, but till this very day I still receive their calls. Sometimes they just call and when I pick up the phone they drop it they also drop the call while I am telling them that I am not who they are looking for before I can even finish talking and they call the next day.

They send me SMS's are well about purchases I know nothing about.