I am not sure your concern is with Comcast. It sounds like you have an issue with USPS. I would recommend contact them instead of filing a complaint with Comcast. Comcast does not control USPS and if they have a policy that they have to send it to you via USPS to your home/service address, there is not much the BBB can do to assist. A simple Google search will provide you with the contact info for USPS and a place to report your concerns about not receiving your mail.
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