Actually this booking did uploaded incorrect rate at 2,500 selling instead of 3,400 THB. however the original booking paid only 2,500 THB. so we cannot make a refundable booking to customer due to new room are more expensive. Thus please ask customer if they able to accept 2,300 THB or try if customer understand and possible to accept as original cost will be grateful then Expedia will absorb the variance different .