NO emails again after no emails for 10 days in December

I am once again getting the dreaded FORBIDDEN and language Luxemburghish message when I try and access my emails via the web. Meanwhile Outlook is running incredibly slowly and my Broadband as well.  I was told on the 17th December that the problem had been fixed and would not happen again. 

this is the message I am getting. 

I would appreciate a call as I feel physically sick at thought of another eight hours on the helpline which is what I endured in December