It sounds like you're all a bit hazy on the rules, which is leading to the DM being a bit of a cheat.
Lets start at the beginning:
The villain used his simulacrum to deceive us, used Sutble Metamagic + Enemies Abound secretly.
The barbarian's attack defeats instantly the Evocation Wizard (Alread damaged). Meanwhile the Simulacrum has gone far.
Enemies abound doesn't actually force you to attack anyone. It just means that when you
do attack, you must choose a random target. Now maybe what happened is the Simulacrum, the evoker and the barbarian were all standing right next to each other (which seems odd), and then the simulacrum provoked an AOO, at which point the barbarian would be forced to take it, and forced to roll to see who he attacked.
Additionally, the spell should have started combat (albeit with you guys being surprised). The barbarian gets advantage on his initiative check, and can act normally on his first action as long as he rages (ie - he wouldn't act surprised). If he's a berserker, he would then be immune to enemies abound, since he's immune to fear while raging.
Then appeared the Villain and his Simulacrum flying (Free Divine Soul wings) a long distance.
The Villain's attack was devasting:
Distant Metamagic + Empower Metamagic + Spellsniper feat + Repeling Eldrich Blast (480 feet, Repelling 10 feet each hit, WTF) and Quicken Spiritual Weapon
While the Simulacrum was using Distant Metamagic + Earth Bind (600 feet range, Wait what?) + Quicken Empowered Repelling Eldrich Blast.
You can't cast a bonus action spell and any other spell in a round, and you can't combine metamagic except for empower, so this round is illegal.
Also I assume the spiritual weapon did nothing, since it's way, way, way out of range of you and nobody has bonus actions to make it reposition.
While I was Earth Binded, Quicken Empower Magic Missale + Repelling Eldrich Blast was devasting against me.
Spell sniper doesn't work for magic missile, so he's had to close in for this. Earth bind only stops you from flying, and does not restrain you in any other way.
Quicken Death Ward, Heal, Life Transference, Freedom of Moment Silence, Revify and contingency : Revify (The villain's spells avaiable)
I don't know what you mean here. I'm assuming he didn't cast these all in a single round or something.
The Abjuration Wizard casted Fly to help the team (Concentration), but lost concentration check when attacked.
This was kind of his own fault, if he cast fly when the bad guys are up next, and didn't hide after doing so...
I was talking to my DM, he interrupted the session when Abjuration Wizard lost concentration, he is "Earth Binded" and now the Simulacrum will cast Distant Metamagic + Silence. (No Shield against 5th level distant empowered Magic Missales) It's the end.
This is getting quite muddled, but make sure he doesn't try to use earthbind to force you to stay in the silence(all it does is stop you flying), make the silence move to keep on you (it's stationary and only 20ft radius), nor use silence and quickened magic missiles in a single round (that's cheating).