Bad service from fibre company

I have a fibre connection box and on Monday around 14pm it just discontinued working it had a red light flicking ....I called my service provider sadv and they sent a message on what's up saying vumatel has a technical problem and are working on it Tuesday was same story Wednesday same story but the gave me a ref to prove they logged a call ...Thursday te hnician came sprayed the box and within a minute it was fixed I asked why it did this he had no answer....within one hour the red light came back and signal gone...I called sadv again and they said the technicians will come back today is surtaday afternoon I'm sitting doing nothing wAiting for technicians my life is stuck and yet I cannot cancell the deal now because they will never refund the 400 I paid on Monday because I thought maybe I need to pay but it was a technical problem....I feel that the service is very bad be ause when you followup you get a new consultant and you explain over and over so basically both vumatel and sadv have a bad very bad service as far as I can tell