Getting Help with Cunard Cruise Concerns - 1 8oo--837~44~6o or 1 8oo--4o6~84~95 Most cruise vacations go smoothly, but there may be occasions when you need assistance with a reservation, onboard service, billing concern, itinerary change, or another travel-related issue. If your concern has not been resolved through the usual customer service channels, you may wish to escalate the matter through the appropriate support process.