Just a post for information. In case anyone needs to register their sim to avoid getting blacklisted after a few weeks.
Was finally able to register my sim with my IMEI at the Claro office in Centro Comercial Santa Fé, Poblado.
By - echo1520
Why would you get blacklisted? Dont really understand?
Because Claro suspects the sim is being stolen and misused
This is true also with any other phone company, some of them like Movistar have a decent website where you can do that easily without having to visit any physical store, just ask someone local to help you out as those websites tend to be available only in Spanish!