We are sorry about your unpleasant experience with our Samsung Care+ support team that you were unable to reach out in order to verify your Samsung Care+ warranty registration, and we apologize for the inconvenience it caused you.
It's really hard to understand after trying several attempts to call the landline number but to no avail, in addition to the cost incurred by calling that number. For sure, if it happens to me, I will feel frustrated too. But don't worry, we are here to guide you.
You may contact us via our online Samsung Customer Care support channels below.