Booked a Christmas Celebration Cruise with Cunard for 23rd December 2021 departure & paid £1124 deposit on 25th of February 2020. We were informed by Cunard by Email that our cruise ship has been changed from the Queen Victoria to the Queen Elizabeth & by way of good will our balance of £6090 need not be paid until 30 days before departure. Vision Cruise representative refused to accept this & was quite rude in insisting the balance must be received by them 90 days before departure. Again we checked with Cunard & were informed that their Email was correct. Have forwarded Cunards Email to Vision Cruise with no response. Sharp practice?