Fault for six days, affecting business

One phone line (our public number) went down on Friday, and was reported. It worked for about half an hour late that afternoon, but then stopped, and was reported again. It was reported yet again on Monday morning. Around lunch time Monday, the call centre contacted us on the faulty number, and it was working again. Then it went down again on Monday and was reported again - with the call centre telling us there was an ongoing fault at the exchange. It has been followed up every day, with an \urgent escalation"recorded by the help desk this morning - and now BOTH phone lines are down. It has been six days"