Just be careful about the accusation. Your friend NEEDS to have irrefutable PROOF that the delay is deliberate and nothing beats documentation. Word of mouth won't cut it.
Once or IF that evidence is available, it's then a matter of writing to the PM's office directly. From there, it will be channelled to the relevant departments, and yes, things will definitely move faster. Do not threathen to bring the matter to the media, unless he wants to infuriate the relevant depts more, and such a move might force them to do whatever necessary to 'protect' themselves. This applies to many matters in life, and the media is usually the very last resort as it's a sure means of mass embarassement.
IF that evidence does not exist, then I would suggest exploring all external options available, including seeking urgent assistance from IMH directly on a weekend when he is booked out. Afterall, if your friend's brother is already on the verge of a massive break-down, there's nothing wrong with seeking help from IMH. Other avenues might take longer and be a bit more of a round-about. Afterthought - I wonder if seeking assistance from IMH should have actually been the first step, if the condition is genuine.
One thing though - I would strongly caution against saying anything in an accusatory tone or manner at least till he is physically out of camp and under the care of a different dept (IMH) and till there's solid evidence to prove his case.