Grand Celebration Cruises Vacation does not expire until April 5 2019 and company wants me to pay $600 additional to re-activate to use package.

I bought the package in 2016.  I had a injury to my a back and was not able to take the vacation.  I paid to extend the vacation package to April 5 2019.  I called 1/24/19 to see about booking the trip and checking the expiration date.   I was told I could not use it and I had to pay an additional 600.  They also said nothing was available until May 2019.  I requested a manager.  On 1/28 Charolette called me and said they called me to book.  The calls I received were for new vacation packages.  Not the existing package.

I should not have to pay an additional 600 for a package that does not expire until April 5, 2019