Fireboltt — Feature missing

I bought a fireboltt ninja call2 smart watch. It is clearly printed on the back of the pack that “ main features- heart rate, sp02, blood pressure etc. But after unboxing I found blood pressure is missing.
No option in the watch or phone app. The shop owner told that he didn’t know, because he didn’t unbox it before and checked. What should I do? I bought this mainly for heart rate, BT call, blood pressure and spO2.

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