Non deliverence of service

Every month like clockwork they cut you immediately if you do not pay on time, however for the last week they cannot commit to what you pay for, extended periods with no network however the full amount is due upfront and their usual excuse is they know there is a network problem bla bla bla, how are you going to ensure i get what i pay for or must i just accept it is ok to pay for a service you clearly are unable to deliver??? Is it ol to *****?