For starters: Nothing much happens at the weekend, except for businesses that pay a premium. Getting your phone back, before Monday evening, was quite a coupe.
Have you any idea what caused the line failure?
Give their engineers a little time to address the problem on Monday.
Check the connection on Monday after lunch, giving them the "Report Reference Number" that you have been given, and if it has not been reconnected. Quietly ask them to give you an estimated time of reconnection.
It is more than likely a problem at the Exchange.