Failed installation terrible service PERIOD!

I am highly disappointed and frustrated with Supersonic. Since the day our fiber was installed on the 21.09.2020 it has not worked. I call them every other day to try and fix the problem but no one can assist me, they do not even bother to call you back after they indicate that they would. I hold on the line for more then 30 min with every call, only to be told a query has been logged. I've been sent from pillar to post from SADV TO VUMATEL BACK TO SUPERSONIC. SADV indicated that they no longer deal with Supersonic and that we have to contact Vumatel but Vumatel cannot be directly contacted you have to wait for them to call you which never happens. So when I call Supersonic back all I get is that a senior technician will call me. But they never do. We have done all the trouble shooting and still nothing works. On Monday they indicated that it was a failed installation but yet again to date nobody has called me back with a resolution to the problem, meanwhile I`m being billed for a service I`ve never received nor been able to use. Frustrating is an under statement.