Unknown Person — Unlimited phone calls

Address:

Indirapurama Ghaziabad

I've been receiving calls and text messages from an unknown number. Also apparently the person sending the person using that number has given my phone number to other friends of his. These friends have also been calling and sending text messages on my mobile. I haven't deleted any of the messages sent to me. Also most of the calls and numbers are saved in the call log. I've been losing sleep over this matter for about a month now.