This is the scenario should be:
The premium you paid RM400 is for July and August and the subsequent premium will be on September for RM200.
I'm sure you are talking about sum assured of RM140k and no premium RM140k ain't it?

Below is my recommendation:
I'd advise you to reduce your medical card to Smart Medic Xtra 150 and take Smart Extender 90k instead of Smart Medic Enhancer and then increase your sum assured as your wish, RM140k.

The reason is because the the annual limit for Smart Medic Xtra 200 + Smart Extender is RM1,320,000 whereas Smart Medix Xtra 150 + Smart Extender is RM990,000. The question you would need to ask yourself, do you need  1.3million annual limit? I'd say that 990k annual limit would be sufficient for the next 30 years and you may increase your other benefit..

Furthermore, there will be no penalty if you live in higher room&board for Smart Medic Xtra + Smart Extender, just top up the different Room&Board will do and you will have no further worry since Great Eastern have covered your
medical bill up to RM990,000 annually.