Gaana.com — Spam and no OPT-OUT option

I have never subscribed or downloaded or listened to any music on Gaana even for a second. However, I am still getting spammed by them. I never shared my email with them. (I got it for free when I got Airtel service when I was traveling in India years ago but was never interested in then or now). I’m being spammed by Gaana relentlessly and frequently since then. They don’t give an OPT-OUT or Unsubscribe option in their email messages. Nor can you give feedback on their website. Their HELP section, they say, only works from 9am to 7.30pm. That’s ridiculous! A schedule for HELP/Support?! Also, what time zone? IST? GMT? EST?