I think you didnt read their FAQ:
Let me quote it here
Source: https://www.u.com.my/en/personal/support/fa.../data-booster-5

So there is your answer.
You should had opted for GX30 Unlimited instead - For the (older) Unlimited Funz Pack users
https://www.u.com.my/en/personal/mobile-pla...limited-prepaid

Or U35 Unlimited - For the newer Prepaid pack
https://www.u.com.my/en/personal/mobile-pla...epaid/u-prepaid

At least it comes with a mere 3-6GB Hotspot but tons of non-hotspot data for you to download.