You pick any one offer pack of 10k, 15k or 20k. We are offering pack of 14k-15k in 10k only and that 10k also we are refunding to you. For 10k refund when 10 new customers will purchase the pack and from you will get your money refund that means when 11 customers will purchase 1st customer person get cash back, when 21 customer will purchase 2nd will get cash back and so on. i.e. this is first come first preference.