No Internet connection

Good day. This will be the 3rd month that my internet has gone off. 1st month June 3 days, July 5 days, and now again. This is a monthly occurrence. When I asked billing if they going to credit my account for the amount of days it was off they said but I must pay for the full month, what **** is that. It was a total of 8 days that I have been sitting without internet and now again. This is utter bull****