Not sure what your question is.

For any FD, it is impossible to add monthly interest into a currently running FD to make it grow in a compound style. Fixed simply means no adding at all either from interest or any fixed salary deposit or any kind of variable amount deposit.
You should just think of it as follows. You lend some money to the bank. It takes the money and invest /loan it at a iixed rate to a borrower to cover the interest to pay to you from his profit in the deal.
The bank cannot accept more money into this settled agreed deal as the borrower already not interested in more money at the same terms. Thus any additional money can only placed for another new FD principal for another deal for handling another bank borrower at some other rates or period.

This is not the same way as scam / Ponzi scheme where the final business objective is to collect as much money as possible in whatever attractive way from the sucker.

After period for the FD is over, most novices make the HUGE MISTAKE of not removing/redeeming but let it autorenew or autorenew with interest added on, which will then be at whatever board rate which will usually be lower than promo rate. Over time and a number of FDs, you will usually lose/forego a substantial amount of money by not redeeming quicky and placing at some other promo., and the bank will gain tremendously from such lack of financial understanding or ignorance of the arithmetic on the part of the depositor.

Compulsory or voluntary choices are available in promo eFD or normal lower eFD but this depends on the terms and conditions of the  offer and it can be different for different offers. Just have to look carefully. Even if the interest and principal are auto add-on and auto renew on rollover at maturity , you can still redeem on maturity date, or later (which is losing).

think about the interest you WON'T get if you withdraw before maturity. Then you will know what to do LOL

yes, they'll deduct from you principal, I kena one recently

I think this FD promo is no longer available..?
I cannot find it on May Bank 2u website?

Yesterday I inquired about the FD rate at Ambank. If I'm not mistaken it is also 4.4 %. Don't know the tenure of the deposit. She said must open a saving account.
I don't see this rate on their website. So will put into CIMB Bank. Already have a saving accounts at CIMB. This money originally from RHB Bank.
Thanks for the information. Still will go to Ambank and ask a 2nd time.