Firstcry.com — Not taking return of the defected Babyhug pram

I have purchased Babyhug Pram with order Id 3237537BZQFF8E758 from firstcry. The product I received was defected, moreover the quality of the pram is pathetic. So I raised the return of the product, firstly they canceled my request by saying I have selected wrong option. I reraised the return request. The customer care team called me and assured me that return will happen in 7 days. Now I again got a call and they are saying only replacement can be done. The product is of very low quality and I need a return. I need my money back. Please help,