Get the right contact details!

Vericred collections keep phoning me look for someone completely different and each time I tell them that person isn't at this number and to remove my number from their records but yet I keep receiving phone calls. One of their consultants even asked me for the person they are looking for's telephone number as if I'm a telephone directory. Please can you people ensure once and for all that my number is taken off this person's contact information I am no ones secretary nor am I a telephone directory. These calls are beyond irritating and a waste of my time