Installation was done on 16 July

Installation was done on 16 July. To date I have been frustrated having no internet connection, today being 21 July. I've been told to switch the router on and off. Then the router was reconfigured. Still no solution to the problem. This has been going on every day for the past 4 days. No one can tell me what the problem is. By law I can cancel within 5 working days, and now there is a request for a cancellation fee. This is the worst experience yet