You may choose to dispute, provided you know what did UBB do with your money - in this case, do you even have any idea where is your money invested for that return? Do you even understand any underlying risk?
In any case, I'm sure you've signed off some documents to agree to undertake the risk to allow the trustee (UBB) to invest your money for a return. If there is any losses, that's on you.
The purpose of BNM or SC in a picture is in the event of such dispute, there is a entity that you can go to which is covered by law. Ask yourself why no trustee firms operate cash trust that gives high returns even though they're more established or well-known than UBB? The only act that you can rely on would be the Trustee Act 1949 - purview of Suruhanjaya Syarikat Malaysia (SSM)
You can file your court case but that's on your own expense to seek for "damages" but like I said, there is no such thing as risk free "investment" for a high return.
Understand this Example
1. You (Settlor) pass your money to UBB (Trustee) to hold on your money and allow them to invest it on your behalf.
Same scenario
2. You (Settlor) pass your money to John (Trustee) to hold on your money and allow John to invest it on your behalf, any losses, you can't blame John for losing the money other than being mad at him but that's your issue because you trust in John's ability to "invest" your money. Now you want to sue John for your losses because you trusted him?
- Do you even know where John invest your money to? - "Unknown & Non-Disclosure"
- Did John tell you what's the risk of investing with him? - "Unknown & Non-Disclosure"
- Did John guarantee anything to you? if yes, that's on his own capacity to fulfill it. Not obligated by law if he's not honoring it. - "Projected returns"
I know how trustee system works which is why I stay away from ubb Fromm the get go
SC and BNM are only fronts for legal approval and transfers while any disputes still need to be dragged to court of law in the end