Relax, you can only do what you can do. If you have left voice mails and emails it is time to go do something else for a while. Then check back and see if the recorded line is available. Try the recorded line on and off through the day. If by about the end of the day if the line is not working and you have not received feedback from the company, email and request reschedule or to cancel and mention the number of attempts you have made today and mention that you have left both voicemails and emails with the MSC.
The MSC is more than likely aware that the recorded line has failed and probably has no confirmation as to when it will be back up and running. Based on an email at the end of the day about your attempts that failed because of a MSC problem, my opinion is that if they are an ethical company, you should get paid. Form your opinion about whether the company is worth working for in the future based on how they eventually handle the situation. Right now they are probably hoping the will be back up in the next hour or two.