The situation you describe is EXACTLY why counselling is never recommended where abuse is a factor.
She seemingly was taken in by his BS, or is too inexperienced to notice that he played her to get to you. yes a complaint would be valid I think as the pair of them have ganged up on you, but tbh you have a bigger fight to fight
YOU need some RL support. In the first instance call WA, they will listen to you and reinforce the areas that you need backing up in, namely that you are in an abusive relationship and will support you in your journey.
Ultimately you do have to leave him. There IS no other option.. The sooner you realise that there is only one realistic way to resolve this, and that is to leave.
IF he suddenly has an attack of the normals and decides to stop being an abuser, ONCE he's proved he's changed, you can always go back.... (take a seat though, it could be a while... if ever)
The ONLY and infinitesimally small chance that men ever stop abusing their partners is when ALL the support they have from ALL corners in their lives is removed from them as a result of their recognised and publicised abuse of you.
Even then, it's a slim chance that they will allow their conscience to be pricked and relinquish their entitlement to abuse you.
Look at this relationship as doomed. It is. I'm sorry. I know that will upset you, but in some way if you face that fact now, you will soon come to appreciate that this abusive treatment of you will stop. You will live in peace, there will be no more insults, names, put downs, silences or worse.