Renewal, mine is 6 Nov, still stated as RM69.90. Wonder if we can keep old price?

Got my notification for price increase......   

lets put some hypothetical dates in, just assume all dates in same month.

if next renewal on 21st,
and i decide to switch from One RM19.90 to Arcade+iCloud RM23.90 (avoid One RM29.90) on 13th,

then the next renewal date will be base on (to)day i change plan? or upon expiry of One RM19.90?

i'm no longer concerned about the price.
resigned to the fact that price is revised.

i am concerned of the date of next renewal if i change plan half-way through existing plan.

will the new ala-carte plan and charged take effect immediately (and future renewal be based on "today") i.e did not wait for One RM19.90 to expire on 21st?

or will new ala-carte plan only start taking effect after 21st? (and renewal will stick to future 21st)

looking to sub,

but what can the host check? thinking to share with strangers