Sadv is the most useless fibre provider!!

I made an application with Sadv early June they have their white box installed on my wall in my unit. I was told i had to apply through them only ,which i did. I made several phone calls before a company called Nano fibre called telling me that i had complained that my line was not working which surprised me because i did not call anyone in this regard. A few days later i received a message that my installing was going to be done the next morning at 08:30am. Noone showed up. I kept calling and even went to Sadv offices noone is there!! I have spent money calling them and the first days they said they didnt have the black box. Two weeks ago they confirmed they have the black box and they kept saying Nano fibre will come and install. Noone has come through its almost 2 months now!! Nano fibre dont answer their phones they apparently moved from their premises!! And i spoke to one Dean from Nano fibre who now gives his wife his phone to answer he has been avoiding my calls!!Its a total joke. I am stuck with Sadv because everywhere i go they tell me because Sadv put the white box they will have to install the black box!! But how long should i wait ? they say turn around time is 2 weeks all lies everytime i call the agents tell me they have excalleted the matter for the past month and a half. I am sick and tired of this can someone help install my black box!! My reference number is *** am not amuses SAdv have inconvenienced me and even the emails for the so called managers!! Noone response i have sent a dozen emails no response . This is the most useless internet provider i have ever encountered!!