Shocking service (or lack of it) from Supersonic

I have had no WiFi connection for 2 full days now and there are 3 of us working from home! My job is contract so 'no work no pay' for me! We logged a call at 8.30am on Monday 25th April. We phoned a further 3 times with no resolution. Today we phoned again and and asked for a Supervisor. They promised that Edith would phone us back within 30 mins. No call received! We phoned again at around 1pm and they promised to phone back before close of business... it's now 7pm and we are still waiting. The lack of service and attention is absolutely shocking.. Unacceptably poor service!