https://www.maxis.com.my/en/broadband/maxis-home-4g-wifi/

Don’t think you have any other legal option now.

Use your own modem so no contract. A lot of people selling their huawei modems on Lazada or Shopee

Cancel after 3 months

Is this for holiday home?

Why not switch your main home to maxis, then your phone lines and supplementaries will also get unlimited data (300gb fup after that just 480p video) but you can use that instead