I am not Mrs. Britz

For about 3 years I've been receiving phone calls and SMSs from this company I've never heard of looking for a Mrs. Britz, and even though I've told them countless times that they have the wrong number, they just don't seem to be able to grasp that concept. I've been told more than once by both telemarketers and their managing supervisors that my number would be removed from all contact lists but they still keep bothering me. I dont know what else to do. Considering pressing charges for continued harassment if it happens again.