Cancelling holiday due to illness advice .

[esetest]

Mum and dad were due to go on cruise with Royal Caribbean on the  14th june , but she has to have a vital operation on the 9th june  , so they won't be able to go , the balance of the holiday had to be paid 16 weeks before the holiday , so they have paid the £4000 , the insurance company have told them that they are not covered because its a recurring illness ,is it worth dad trying to appeal to the companys better nature and see if they can transfer the holiday when mum is better .