Receiving calls for other clients

This is becoming so frustrating to keep on receiving call for the lawyers representing Virgin active regarding other person account. I don't have an account with Virgin active however lawyer representing Virgin active are harassing me and sometimes they call on my phone and drop the call without anyone saying anything. When calling back this number these lawyers are giving me a very bad attitude saying that my number is being called by their system and they are unable to help me. this is very frustrating