Land line no working!

My mother in law has had the same problem occur twice in the space of a month. Her land line does not work for a week and once she has reported the problem it takes 3 or more days for the problem to be rectified. And with this happening every month, it takes time and effort to sort it out. This can't keep happening every month, as she uses her land line, and pays her account. This is no fair on her and others you have the same problem.