I have visited Joylukkas in Delhi today for selling my old Joylukkas jewellery .They have Gavin me receipt in for form of a document called as Purchase invoice amounting to Rs 59600 approx.Is this the correct document?Is this the same as what we call as Refund receipt?

I want to join in gold scheme

I purchase dimond magal sutra bill no SAD598dt9.8.16 from Kolkata.To my son gone there for exchange of pandel of staff is not satisfied to my son.The cirtificate of pandel also shown,he want to purchase gold but refused.kindly enquiry thematter.Thanks