thank you for addressing your question in the community. I went through the letter and I highly suggest that you take the oppertunity to address the open question with the support of your lawyer.
In case you are feeling that the lawyer is not helping in your case, there are free legal consultation you can go to in order to get some assistance with the letter you received.
Unfortunately I cannot help further with the Informations given.
If you need further assistance please feel free to address them here.