No Support from Advance/Managers! WORST SERVICE EVER

I Give Up with this company! I've had rain for 2 months now and out of those 2 months I had a full 2 weeks of uninterrupted Wifi. There is no call back from ADVANCE! I've had multiple calls logged with them and no one phones me back! As a person working from Home my life is dependent on getting this Wifi to work. WHO ELSE CAN I CALL!!!????? Your consultants aren't helping anymore the issues are above them and they can't put me through to a manager or the advance department! I'm going to lose my JOB due to a network service that doesn't want to do their JOB! PLEASE ADVICE HOW I CAN CONTACT MANAGERS/ADVANCE this is urgent!!!