Tata Sky — Activated Tata Play Binge without consent

I had ordered a remote from Tata Play and my parents took the delivery for it.
The tata sky executive took tata sky otp from my parents phone and activated tata play binge and ₹300 was debited. He gave the reason that its necessary to give otp to activate remote's warranty.
This can also result in bigger fraud like taking bank otp.
We had trusted tata sky but it was in vain. Very disappointed