I sorry that your Comcast Digital Voice and High Speed Internet are in outage situation at your business. This forum is the closest facility to contacting a bonafide Comcast representative for assistance. However, your quickest technical assistance would be to contact 1800-391-300 from a friend's cell or neighbor's telephone.
Lastly, if you have online access to your Business Class Portal then you can use this to determine online issues with you services.
Sorry to hear about the issues, in order to get this to the proper group (assuming you have some access to the web via mobile or another source) can you please PM me your account number?