Ajio — Online scam

One girl called me today and I picked her call she said that ur a lucky customer she told 5 gifts are there you have to choose 1 gift so I choose TV then she asked me to shop for 5000 then I ordered some dresses.and i payed 5199 through online.then they sent me messages to my what'sapp.the they started explaining about the gifts vouchers and after that they said you have pay 12999.9 for gst they said if you pay 12999.9 we will re refund your amount within 5mins and 2500 cashback also you will recieve.then I thought it's true then again I payed online payed 12999.90.after that they said your payment is processing because your paying gst for the first time then they said you pay 12999. 09 again then we will refund your money of nearly 26000. I was shocked I thought it's fraud but the person who was talking with me she said to refund my money he said complete your gst then only we will refund your money back.he said if you think you will get your money through complaint the you do that. Kindly plz help me I lost my money.