I'm so sorry to hear this Miracle , it's so unfair and you don't deserve to be treated like this .
But, and I wish I didn't have to say this , I strongly advise you not to complain. SS are very VERY vindictive towards complainants and they have long memories .
You might think there's nothing else they can do to you but there is. They can create even more delays, " lose " letters and photos , document that they have given them to you when they haven't .
They could recommend that letterbox contact is stopped " because you can't handle it / find it too distressing / it's affecting your mental health " .
They could tell the adopters that you have made threats are unstable and get the adopters to stop it . They could say they think you are a risk to them .
And there's nothing you can do about any of this , because it's " professional opinion " .
If you request to see files, they will have them redacted .
In the longer term, if you ever have another child ( or cohabit with someone who does ) , they could seek to have that child removed .
I'm sorry, I know this isn't what you want to hear . And no doubt some SW will pop in to say that they personally would never do this so therefore it's never happened to anyone ever in the UK . But that's bollocks .
The very worst crime to a SW is not neglected or abusing a child. It's disagreeing with them, which they call " not being cooperative " and it's grounds to lose your child. Or in your case, to lose the contact you still have with your child .
I'm sorry, I know they sounds very defeatist but I think you have to put up with it . Complaining is a very high risk thing to do .