Investing has risks. You cannot do anything unless you're suggesting there was an element of fraud in play, which is highly unlikely.

Funds #6 & 7 were severely impacted. The fund managers have to answer for the concentration risk they did with such a significant portion of the funds' portfolio invested in the sukuk.

These are the risks investing in unit trusts, I don't think unitholders can claim back the money - there are no PIDM for unit trust funds.

Maybe can sue for damages if the fund managers & trustees violate their own trust deed/stated fund objectives by overconcentrating in one sukuk, but it is unlikely you can get your money back.

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I no longer follow UT in Malaysia. But from the RHB Income Trust Fund 2 prospectus at https://studylib.net/doc/8658389/rhb-income-fund-2. The regulatory body is Securities Commission. So you can go and file a complaint there. In the prospectus (bottom of page 4 and top of page 5) you can contact RHBAM, SIDREC or SC for complains and dispute resolution.

The RHB Fund prospectus did not mention any mitigation for concentration risk, unlike the UT funds I was more familiar with, the Public Mutual funds - they have investment restrictions in clause 1.4 of the prospectus like the screen shot below where investment in any one issuer cannot exceed 10% of their NAV.

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While it is not mentioned in the RHB prospectus, need to see whether the trust deed between RHB and HSBC Trustees mentioned the investment restriction or not (but I don't think RHBAM and HSBC Trustees will reveal incriminating evidence against themselves to you).

I am no expert, it's just some things I learn how to hold fund managers to their own rules stated in the prospectus and to exit the investment if fund manager violate their own rules.

Isn't this the 2nd time rhb has been hit with this? Iirc weren't their funds badly affected by MEX sukuk before too? (might be wrong and it was a diff fund house if so I apologise)