I think you need to speak to your stepdad and mother.
Regardless of whether or not the letter is a fake , if he is the person that pays the bills it is entirely up to him if he want to block your access to the Internet.
It is not a matter for this forum.
This really is one strange situation but as has been mentioned before the account holder can really do what they want and restrict who they want from their connection.
The letter, however, is 100% fake.
The error message you are getting "bt access controls has blocked your internet use" tells you that access has been blocked by BT Access Controls which are controls set up by the hub admin.
I think it's time you had a conversation with both tbh.
I suspect that a young person is hoping the forum members will blindly assist in giving information how to get around access controls and his step father preventing him/her from using the Internet.
Hi you have suspected wrong there my friend I am 27years old I promise that thats why this situation is actually laughable and pathetic my stepdad is a control freak and my mom is scared to say anything to him long as the letters 100% fake then I have solid proof to speak to them both about this ridiculous situation.
Of course we only have your say so that you are 27 years old but in any event it is not a matter for this forum.
Granted so but I wouldn't lie so if it isn't a matter for this forum who should I seek help from mr smart alex? I am an adult and this simply shouldn't be going on all I needed was proof that my stepdad has made a fake BT letter which is fraud and bang out of order!
My name is not alex!!
How is it fraud? He is not gaining anything. If you believe it to be fraud contact the Police and I'm sure they will keep you right.
If you want to know if it is genuine or not contact the company that it purports to be from, not a BT residential customer to customer forum.