RummyCircle.com — Excessive message spamming without any account

Hi,
They are sending me promotional spam messages on a daily basis on my personal mobile number. I have never visited their website. I don't know how they got my number. I block them everytime but they change their number and send message again

For example message, i received today[
"gifted: you have rs2000 in you rummy a/c

Claim it here by downloading & playing rummy now: link