Sansui India — sansui tablet sapphire st72 pro f11

Address:

Hisar, Haryana, 125001

I purchased this sansui tablet sapphire st72 pro f11 with 1gb ram and 16 gb rom and 3000 mah battery in white colour b07jn61j2x,
Serial no. [protected] through amazon india. The tablet was received on 30th november 2018.
The tablet worked for 10 days and died. Now it works sometimes and dies again for a few days.
This tablet was a replacement for an earlier one which was received on 20th november dead on arrival. Amazon india replaced it as it was within 10 days.
The supplier in both cases is shri balaji technoworld co. Basement 1539 urban estate-2, hisar 125001 haryana.
There is a one year warranty on this product. I need a replacement of this defective sansui tablet at the earliest.
None of the sansui customer support nos. Work. An email to their customer support at [protected]@sansuimail.in has not been answered.