Seriously upset customer

I am incredibly dissatisfied with the lack of service I have received from Vumatel over the past 2 weeks. I have been having serious connectivity issues, my ISP changed out my router and checked all hardware and couldn’t find the problem. They logged a ticket with Vumatel on 22 Dec and as of today I am still having serious issues! We did not go away this holiday, all entertainment in my household runs on WiFi. I have been paying for a service that I have not been receiving for close to two weeks now and Vumatel seems to care more about their annual breaks than they do about providing a service. They don’t operate on weekends and it seems the entire business simply went on leave for parts of the Dec holiday. I simply cannot understand how a company that provides such a critical service just shuts down!! I am incredibly unhappy.