Consumer Redressal

Vide orner no 5194312443 dated 07.03.15, I had ordered for sofa cum bed from snapdeal .com. Subsequently , I had ordered for installation of the aforesaid sofa. Payment made for sofa was Rs 9999/- and installation was Rs 499/- . On installation it was observed that it was a sofa which was not converting into bed.After regular follow up the sofa was taken back from my house on 21.06.15 by the Company. They have refunded the installation charges of Rs 499/- but despite daily follow up they have not refunded the cost of sofa. They are citing the refund of installation charges as refund against the sofa cum bed. On my insistence for proof of refund they are demanding bank statement / credit card statement vide which the payment has been made. I have provided the statement sought . But refund has not been made till date. They are deliberately delaying . I wish to claim the amt with int. please advise.