Not knowing your role (I assume a range DPS?), it's hard to offer advice. Before my static disbanded we were progressing well in T7, so I'll just talk about what you said you're having trouble with.
VOIP is very helpful in T7, for calling out VOICE and SHRIEK. Make sure you know the difference between them, of course. Keep Melusine focus targeted so you know what she's using if you don't have VOIP for someone to call it out.
VOICE: projects a petrification cone in the direction you are facing.
SHRIEK: projects a circular wave of petrification around the person it affects.
VOICE is simple to deal with once you are used to it. I advise moving your Status Affect bar somewhere easily visible for your benefit (mine is above my hotbars) so that you can see when you are affected by it. Simply glance at the timer, and when it is down to 1-2 seconds, turn the character to the side or run to the edge of the arena to direct your cone away from the party. If you're a healer, it is your job to face the Renaud when you have VOICE and freeze it (without freezing the kiting bard!).
SHRIEK depends on the coordination of the entire raid to dodge, so this is not always on you! The bard must be kiting the Renaud properly, so that it is in a good position behind the party. The healer must direct their VOICE at the Renaud to freeze it. The person who is afflicted with SHRIEK must position the Renaud between themselves and Melusine (and not be in the Renaud's hit box). The rest of the party must move so they are between the Renaud and Melusine, protected from the SHRIEK, and immediately move back into normal positions when it is done so the fireballs don't stack on people and kill them. All of this while DPSing the adds and the main boss! It takes practice. There will be wipes.
LOSing the SHRIEK is done something like this:
The bard happens to have the Renaud (purple star) there when it is frozen by one of the healers. The person who gains the SHRIEK effect (orange) runs to position themselves with the Renaud between them and Melusine. The party must immediately move into position (greens), the add (red) will be taken with. When SHRIEK goes off, spread out again to avoid fireballs stacking.
That's pretty much all there is. If you're doing this and still dying, or still getting SHRIEKed.. then it's not you!
VOIP is very helpful in T7, for calling out VOICE and SHRIEK. Make sure you know the difference between them, of course. Keep Melusine focus targeted so you know what she's using if you don't have VOIP for someone to call it out.
VOICE: projects a petrification cone in the direction you are facing.
SHRIEK: projects a circular wave of petrification around the person it affects.
VOICE is simple to deal with once you are used to it. I advise moving your Status Affect bar somewhere easily visible for your benefit (mine is above my hotbars) so that you can see when you are affected by it. Simply glance at the timer, and when it is down to 1-2 seconds, turn the character to the side or run to the edge of the arena to direct your cone away from the party. If you're a healer, it is your job to face the Renaud when you have VOICE and freeze it (without freezing the kiting bard!).
SHRIEK depends on the coordination of the entire raid to dodge, so this is not always on you! The bard must be kiting the Renaud properly, so that it is in a good position behind the party. The healer must direct their VOICE at the Renaud to freeze it. The person who is afflicted with SHRIEK must position the Renaud between themselves and Melusine (and not be in the Renaud's hit box). The rest of the party must move so they are between the Renaud and Melusine, protected from the SHRIEK, and immediately move back into normal positions when it is done so the fireballs don't stack on people and kill them. All of this while DPSing the adds and the main boss! It takes practice. There will be wipes.
LOSing the SHRIEK is done something like this:
The bard happens to have the Renaud (purple star) there when it is frozen by one of the healers. The person who gains the SHRIEK effect (orange) runs to position themselves with the Renaud between them and Melusine. The party must immediately move into position (greens), the add (red) will be taken with. When SHRIEK goes off, spread out again to avoid fireballs stacking.
That's pretty much all there is. If you're doing this and still dying, or still getting SHRIEKed.. then it's not you!