Well if the ports are blocked at the new gateway there is nothing you can do because you do not have access to its configuration. You could probably run NetMon or WireShark to try and verify where the packets die. It could be a marketing ploy to convince users running services from their residential line to upgrade to a business account ($$$$) That would explain why the Verizon Tier 1 support are telling you no ports are being blocked because that is a default configuration for a residential line, in that no ports expected to be opened on a residential account are being blocked.
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