i don't think there is notification. you may however email the CS to get an update.

There is balance glitch lately.

That’s due to a recent transaction/ transfer not recorded correctly. Like the other guy- manage to transfer additional 1.5k without real balance.

available top up balance will only be accurate usually about 24 hours.

I'm assuming u had done some transaction earlier maybe withdrawal or make purchase, so u need to wait for it to clear.
Yes their system is stupid because it should be reflected real-time.

I understand they have started to impose top-up limit now. It’s only RM5,000 for every month and this will reset the following month. Since you’ve done 7.5k this month, most likely that’s the reason they are temporarily blocking your account.

Amount?
Did u tried lower amount?