Tata Motors — Continuous spamming

Dear sir,
I have been getting daily SPAM Mails from TATA Motors to Test Drive their TATA TIGOR/ EV or switch to their vehicles. The mails are being sent through Poonawall fincorp / [protected]@connectinboxx.com.
I have repeatedly complained to their customer care but they have done nothing more than ack my mails.
Now, through pages I wish to awaken these spamming agencies so that they stop harassing me. I was never their customer and never will be.
They are misusing my data as I had their shares for some time and have my email ID.
It is shocking to note that companies of TATA, POONAWALLA and Godrej group are resorting to such unethical practices.
If they don't stop I shall take up the matter with SEBI/ Union Govt etc.