Maxis Broadband is suck!

I have using Maxis Broadband more than half year but I feel Maxis was cheating me as a customer. They provide half year for your testing but still need to paid. First few month they provided fast speed wireless broadband to your demo period. After the demo period or half year you will get slow speed broadband. Now I always need to restart the equipment every time the broadband slow. (This is their solution) . Maxis just provided suck and poor broadband service. If you late to make payment, they have extra charge to you but they provided slow broadband to you, do you think they rebate the bill?