We sent a large group of cruise related guests to ...

We sent a large group of cruise related guests to this location last April. For almost a year, we have been trying to get a response from management and have received no reply regarding the terms of our booking. We've tried the analyst department and left messages with the confirmation numbers with no response.
Thank you for replying. I am just requesting to be able to reach any managerial department or the analyst department which we haven't been able to get a response from in weeks. Is there any way to be given a number of someone to finally contact? Thank you.