I suggest that you take the following steps to try to locate the caller who is bothering you:
1. Call your network provider: You can contact your mobile network provider and report the harassing calls or messages. They may be able to assist you in tracking down the caller or providing guidance on how to deal with the situation.
2. Report to the authorities: If the harassment continues despite your efforts, it may be necessary to involve the police. They have the resources to investigate the matter further and take appropriate action to stop the harassment.
3. Keep records: Make sure to keep a record of all the calls and messages you receive from the harasser. This information may be helpful in identifying patterns of behavior or providing evidence to the authorities.
4. Block the number: Most smartphones have the option to block specific numbers. You can block the caller's number to prevent them from contacting you further.
5. Be cautious: Avoid engaging with the caller or responding to their messages, as this may escalate the situation. It's best to let the authorities handle the matter.
Remember, it's important to take action to protect yourself from harassment. Don't hesitate to seek help from your network provider or the authorities if you feel threatened or unsafe.