Firstly OP, whether your supermum, or struggling like some perfectly good people do - Having your kids taken is traumatic and I'm so sorry.
We don't know all the facts OP, only you do. For your kids to be taken away from you, due to calls to child line, there could be something going on that you don't know about. I say that with no judgement and in all humility. Sometimes SS believe it's right to take the kids like this as emergency measures. Yes, they get it wrong all the time. Sometimes parents need support, not their kids taken.
We don't know what type of mother you are, what type of person your partner is or what type of home life you have. Only you do.
So no matter what advice you get on here from people who don't know the facts (including me of course), the most important thing is for you to do is calm down, sit down and have a real think. Go into your sons room and have a look. Question family members, friends, and of course your partner. Then look into legal representation. Please email your local MP.
It's currently half term, but you also need to call school and hold a meeting - You never know what you may find out. You'd also be shocked how with some prodding all types comes out of the woodwork with teaching staff.
He has said something about home life - This is why they've come. Childline will ask questions about parents and the home. I feel so bad for you but can tell you fiercely love your kids.
What was your son like when they took him? Relieved? Confused? Did he contest?
TBH I see some troll hunting surfacing - I've got some issues going on that I desperately want to post about buy I'm so scared. It doesn't matter whether the post is real or not - It could be real and that's all that matters x