Leaking of customer data to various "trading research" companies

I have a zerodha a/c and had an angel broking account as well. Soon after I updated my contact no with angel broking, I started receiving 2-3 calls every day from various people claiming that they provide trading research and advisory and these calls have continued even though I have closed my angel broking account. Now, I can block nos on my phone but keep getting calls from different nos regularly. I has really become very annoying. How can I deal with this? Can someone tell me how these “trading research cos” get my number and what can be done to stop this once and for all?

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A post was merged into an existing topic: I am getting a lot of unsolicited stocks tips SMS messages ever since I opened a trading account, how do I stop these?