Hi, My name is XXXXX XXXXX I’m happy to assist you with your question today.
Your attorney is your agent in a matter and his acceptance of the settlement offer is binding on you. So you are stuck with this amount as your settlement of the matter. So, the case in chief here is settled and there's nothing you can do to re-open it or get more money from the store.
Your question is not clear on whether you actually consented to your attorney accepting that offer for you. As a client you always have final authority to accept a settlement, not your attorney. If you didn't consent, then you may have a malpractice claim against the attorney.
With regard to the fee agreement, you appear to have a dispute with your attorney as to what the terms of his service were; specifically his fees. This is a problem - especially here where you're dealing with limited funds to settle your matter and don't want to spend money on a fee dispute. What you can do is call your local bar association
to determine if they'll mediate a settlement of the dispute. Otherwise, your attorney has to hold the disputed portion of the funds in escrow until the matter is resolved. The only other way you can resolve the matter is by suing the attorney, but then you're in the position of spending money to get the very limited funds you need; not a very good solution of course.
I believe this answers your question. However, if you need clarification or have follow-up questions regarding this matter, I will be happy to continue our conversation – simply reply to this answer. If you are otherwise satisfied with my response, please leave a positive rating as it is the only way I am able to get credit for my answers. Thank you, XXXXX XXXXX wish you all the best with this matter.