The RM128/mth pricing is for maxis one plan user. Yes you do have to sign a contract for it.

I'm currently on the 30mbps plan for my home fibre internet, with 158 maxis one plan for my main phone and a subline, they won't give me the RM20 discount unless I resign another 2 year contract for home fibre internet. And there is no point arguing with them, I've tried, the bottom line is they have to follow their SOP. But on the bright side, I can switch to different ISP whenever I want to without any termination charges.

Unifi?!... >.> The reason why I switched to Maxis