I've subscribed to Woosh VOIP for a few months now. 

Recently, I've been home during normal office hours a lot and found out that it is usually out of service during these hours.

I get a busy tone on any number I call, even the 606 number, which is the voicemail.  I've called and complained about it before and was promised to have my fees reimbursed for the time that there is no service.  After a month, the bill was still the same, no discount or reimbursement.  Sad thing is.. I now found out that the VOIP is usually out during normal office hours.

I am assuming that they do this because most of their subscriber are residential subscriber.

I signed a 1-year contract with them and having such service it would be cheaper to disconnect but there would be a lot of inconvenience.  I would rather have the service improved.

Any suggestion how I can make a formal complaint with them?  Looking at how Woosh work, they make sure that you do not have any way of submitting a formal complaint.  You either go online or talk to a "less than qualified" call center agent.  Call center agent usually admits they are helpless (or useless) in most occassions, because they are not aware of any ongoing maintenance or any activity that may cause failure of service.