Unexceptable Service

We had a Telkom guy at our company to put a extra line in one of our department. When he finished all the departments in the company's lines were dead. He came to tell us he is finished and leaving now. We told him he must fix the lines because everything was fine until he worked on the line, now all the lines in the whole company are dead. He just told it is not his problem if we had a problem we must phone Telkom.....hello....without telephone lines. When we told him but he caused the problem and must sort it out he was ****y with us and just said his instruction were to install a new line and he did that and is leaving now. And he left. This is unexceptable, this is not one house line, it is over 30 lines in the company. How are we suppose to run a company without telephone lines. MacDonald's Transport Bellville