Yaari — Complaint regarding yaari didn't credited refund to my bank account

I ordered a women's necklace set which contains two piece of necklace from the yarri app of 319 rs.but when i received the parcel i open it and seen that i received only single piece of necklace so thats why i placed return request for that product .and there is clearly mentioned that your refund received in. 7-10 days but now 10 days are over but didint received my refund from the yarri . usually its takes only 3-5 days from other shopping apps .but my parcel has been picked up by next day but still i didn't receive my refund .