Medical emergency Malaysia airlines

Can anyone please tell me where I stand,
I flew out on Malaysia airlines mh003 on September 15 this year,
During the flight a medical emergency occurred during which a illegal immigrant was being deported,
The deportee had smuggled a razor blade on board and slashed his wrists, in the toilets after takeoff, despite having 2 security officers with him,
We returned back to Heathrow, and was told that a new crew would be called for, and we would fly at 6 pm that night, no problem with that just a long delay,
But as 6 pm was almost near, we were informed that we were not going as they could not get a new crew, where do I stand claiming compensation for not the medical emergency delay , but for the airline saying we were flying, then not hope someone can help, many thanks