Calling me constantly and hanging up want to know who owns this number

I think she used someone else's phone she keeps calling on a private number Leisa dorrington and she has changed her number about 20 times can you help so I can find her number she has now and I can put spam on it and just won't answer it because I will be able to see its her she has even got my email and she has changed my voic Mail I don't know how she is doing this