https robu in - Faulty item shipped

I've placed an order (#******) in robu.in and received the ordered items. On receipt i found * items out o * are not functioning.
*)DC **V **mm Super Ultrasonic Mist Maker Humidifier Atomizer × * ₹ *,***.**
*)DHT** Digital Temperature and Humidity Sensor Module AM**** × * ₹ ***.** .
I returned back those items. Now support at robu.in is saying i have sorted the * items, out of *. But i have the evidence on video which i took before sending it back. While connecting with multimeter , and powerd with power supply (**V), multimeter was reading **V along with the defective item which they claim its sorted. There is some internal defect and now they are claiming it is sorted to evade refund.