Doing a quick search at Emirates the ticket DXB - BKK I'm kind of holding at the moment sells for 3600 Euro in the same tariff. I paid 2700 Euro for TUN - BKK (which is a steal admittedly). CMN - BKK goes for 3800 Euro and CAI - BKK for 4300 Euro. I would be willing to pay an extra of maybe around 400 or 500 Euro plus arranging the transfer to CMN by myself, but the 1150 they want is out of question. In that case I'd rather cancel, forfeit the expenses I had, take the refund and rebook on a different carrier