Yes

I'm confused.

Was 2nd day after registering at maxis center. so i'd guess there was about 3.5d left still from the initial 5 days.

I topped up a first RM30 on 20th November, and validity bumped to 20th December.

(1) So this "extend" validity - isn't it supposed to add to existing validity?

(2) So if I top-up RM10 today, am I going to get 30+10 days of validity? Or am I to expect the system to prevail whichever is the longest between new top up and existing validity i.e. since existing is longer by ~29d, the system will keep that and ignores validity brought by RM10 top up.