Lenskart — broken specs delivered

Order placed at Lenskart store on 4th May for two frames. - one full frame and one rimless. Full frame was delivered but it was informed to us the the glasses of the rimless frame broke and it will not be delivered that day. The next date that was given to us, the same thing repeated itself. This happened 3 times. Now all we want is the refund of the amount of the rimless frame because Lenskart is not able to deliver the rimless frame. But the call centre executive and their floor managers are denying and are forcing us to take store credit. After these incidents we do not intend to patronize Lenskart.