Comcast Worst Possible Customer Service Nationwide

I have been a Comcast business customer for 7+ years and have experienced the gradual decline of their customer service.  At the moment we are experiencing no voice mail and our hunt group isn't working as a result of a Comcast update to their system 3 weeks ago.  We have called 12 times trying to get this fixed to no avail.  Now we have tried calling the Corporate Offices in PA for the last 3 days only to speak with mere operators who have no customer service skills and can do nothing but "update" our account.  We are told there is a regional manager that is supposed to be calling us (for the last 3 days) and the operator can only send an "internal communiation" once every 24 hours.  They even told us that Comcast called us on Wed 4/6 @ 5 pm and left voicemail - total lie, no caller ID or voicemail from Comcast on the business line or my personal cell phone.  They claim and advertize the great customer service but honestly there isnt any customer service at all.  Just patronizing "operators" with attitude and incredible runaround.  We are still operating without rollover lines and without voicemail working as it should.  What a way to run a business, huh?!  My next step is to write the CEO but I'm sure it would only benefit me, not get results.  You know what they say "crap runs downhill"  Be afraid, be very afraid if you are a business and thinking of using Comcast for your business account.