Whaaky.com — Regarding refund of my money

I have register the complaint against repeatably received the faulty power bank... as i had requested to refund of my money ... neither i got massage from whaaky regarding refund not i got any call... rather than i received the massage from [protected]@pgssupposts.in that they required my contact no. behalf of whaaky for refund money ... i got call from that side ans they are asking my debit card details like card no, exp date, cvv when i told them for RBI guidelines they will not response me ... Pls help me to refund my money from whaaky as i paid[protected] for power bank + 500 as the courier charges as i had paid)... for your information i am also attached the proff of conversion...