Dear Alone,
I know; its so frustrating having to go to such lengths to get rid of these kinds of people and reclaim your life. You can do it, but its just really hard, and it can take a lot of time to get to the `uncontactable' stage.
For me it started with changing my phone numbers, then changing jobs (which took ages), and finally moving house. All of this took longer than 18 months, but I finally got there, and it was a huge weight off! The hardest part, though, is that I'd had a life with my ex, and I was very close to his family and some of his friends. I really wanted to stay close to them, but I had to let it all go, because so long I stayed in contact with them, he was able to find out information about me, and it just fueled his obsession with harming me.
Its really like being reborn, though. You can do it too, Alone!
X bella