They installed fibre in the house for about 3 weeks it’s not working despite my constant followup and being promised technicians will be sent out

They installed fibre in the house for about 3 weeks it’s not working despite my constant followup and being promised technicians will be sent out. There’s no commitment as to when they’ll come out, I even had to log a call that I’m told it takes 72 hours to allocate a technician. Constantly have to buy data that’s is consumed buy multiple big devices and it’s very expensive at this rate.