Inaquan: I'm so sorry to hear of the challenges you're facing. It reminds me of several years ago when I was seeking legal advice and did not wish to spend charity or church funds on what I believed to be pure silliness. I contacted an internet 'free advice' service. I was actually surprised by the responses I received. There were many. Whilst it was a long time ago and I can no longer remember the exact one I went to, I'll provide you with a link to a similar service. They also have a 'consult' option, where you pay for the service. However, you may be able to get some straight forward advice.
May I ask please: Do you think the solicitor who wrote you is aware you are balking at paying more fees and may not be able to do so and as such the solicitor is hoping you won't respond, or refuse, thus moving the grant of the will in their favour? It's just a thought.
http://www.freelawyer.co.uk/about_us.htm
I wish you every success
Fr Bill