Poor service

We ordered fibre in the first week of January the next week they installed it and we recieved a msg saying its active on the 19th of January and since then there was a technical difficulty and each time i phones a week apart amd each time saying they will look into it and when i phoned on the 31st of January they red flag it and the fibre boks showing it is active and when tried using it it stil does mot work once again phoned today the 1 of February and said they wil phone me back tomorrow afternoon. Their service has severely downgraded whe have been their client for almost 3 years and never had a complaint and now with the finre their service is very poor.