You can still get your Bitcoin; however, you will need to place another buy order.
The system cancels all orders automatically if they are not marked as paid within one hour of the order placement. You will receive an email informing you that your order has expired/timed out. When that happens, go to coins.co.th/buy and place another order. You will then have another hour to complete the deposit.
For more information, please feel free to contact us at firstname.lastname@example.org or +66 2 038 5038.