Shocking customer service

I have paid in FULL for my cruise departing on the 20/12/2021. I have yet to receive my tickets which I was told would be emailed to me 21 days prior to departure. I have sent emails and have not received a single reply. I phoned last week and was told I would receive my tickets via email, I have not. I have been trying to phone the call centre all morning, the call has been cut 8 times. Once it was answered and the call ended after being on hold for ten minutes. Completely unacceptable. Where is the customer service?