Flipkart — Not giving refund of prepaid order

Address:

New Delhi, Delhi

I placed the order on 19th may got a delievey date of 22nd may but didn't get the product yet and they are saying product has been delieved to me on 23rd may, even on that day i was not in town.My Order ID : OD[protected] mob - [protected].Now they have sent me courier slip on which someone else signature is mentioned which says these people are trying to make fraud with me.I already paid Rs 3000 for this through my credit card...refund the money asap or else m going to make FIR over this.