Non-existent support if something goes wrong with your internet

2 weeks ago they came to install my new internet and all was good. Had internet for 4 days and then it just randomly stopped working. Sent emails to "support" and they said that my link wasnt handed over but i checked with my project manager and it was handed over. They told me to reboot the router multiple times and reset it but nothing. They then said they'll escalate it and get a "tech" to my premises but nothing. I've emailed them every single day asking for an update (For almost a week now) but they just ignored me. I was also sent a pro rata invoice for internet i basically never used.