Doing best to control internet usage at home

I realise that internet has been quite slow at my side recently and I can feel it slogging away especially during night times after 9pm. I have filed in a feedback to tmnet and they are checking my connectiom which is a 384kbps broadband with 10 hours usage per month. I am also doing my best not to exceed this free hours as the tariff after that is charged at 5 sen/min. That is the reason I seldom online as it would surely exceed because last month I exceeded and paid extra RM65! Thinking of upgrading this plan if my usage would to be increased soon.