Bad Service

Installation took place on 27 March and was not completed due to not having the correct part. Since then I had to call various times to try and have it done. A date was set for 23.04.15 and the team never pitched, not even a phone call to advise that they cannot make it. After phoning on the 24th, I was promised a call today (28.04.15) to arrange for completion, to date nothing. I have put in leave every time to accommodate for this and is not acceptable service. How are we suppose to trust a company who does not deliver? And in such a crucial industry? Thank you. Warren Bryan