Address book killed my email! Is there anybody out there to help me!!!!!

I've been fed up with the lack of proper customer support of Comcast/Xfinity, when you urgently need to call someone you're simply out of luck you have no way of reaching a living human being for support! (including the chat service!).
The new SPAM implementation of Xfinity email system was badly interferring with my email communications, no matter how many times I went into the Xfinity web email "spam" box and declassified desired emails as non-spam it simply doesn't work. Those emails again bounces back from the inbox as spam emails which time to time cause banning of my email address from the mail groups that I regularly communicate.
Recently, the manager of email group advised me to include the mail group's email address in my address book that looked quite reasonable to implement. I just tried to import most frequently communicated email addresses into my address book via automated "import addresses" function. Before the initiation of this action my email box was full 74%, following the automated import address process the web site suggested that I should go back to my email activities and whenever address import process completed I will receive an automated "address import completed" message  from the system management. Instead of address transfer completion message I have received a quota master warning from the postmaster: " Your mailbox size has reached 100% of your quota.

Quo Vadis COMCAST?....