My trip

I have an issue with this flight agence that i booked a ticket for a flight to the USA but the airline deny me the flight because i didn't have a transit visa . My flight is to the USA but the flight had to transit by Belgium so i don't have a visa for Belgium and now the agent here in cape town says i can't get a refund or another flight . My order number of the flight is LUZCBP . Pls assist if you can because this is pure **** and according to the policies of the airline this ticket is refundable but the agence says no . Thanks . Your sincerely.