Breach of agreement term

Im unhappy vuma wifi for the sticking to the agreement time of services which a 30 days packages its doesn't last for that 30 days its end on 29 which was fine but now its ended on 28 was its becoming a pattern now and not sticking to its agreed term im unhappy because even so I don't use wifi during the day because no one its at home so we are not misusing it for it to not last for 40 days