OnePlus India — fraud by oneplus (mobile handset) company

Address:

Patna, Bihar, 800001

To whom it may concerned
I have purchased an oneplus 7t mobile from amazon on 29th sept. 2019.
There was an offer mentioned that the oneplus 7t user will get double data offer by on airtel sim on purchase of oneplus 7t (also mentioned on oneplus official website)
So i bought an airtel sim card and recharged that sim with 249 and followed all the instruction properly .
Still i am not getting double data. I raised this complaint with airtel but they completely denied about such kind of offer for oneplus 7t user so
I raised this issue with oneplus customer care team and my case id is[protected]. my issue is still unresolved.
They are only making fake promises that this issue will be sort out within 24hrs from past 14 days.
This is misrepresentation and fraud by the company as airtel is not providing such kind of offer but oneplus is misrepresenting consumers by showing such kind of offer.
I suffered from mental harrasment because of this.
Help me on this issue
Regards.
Kishan Kumar
Registered email - [protected]@gmail.com
Mobile number - [protected]