UPDATE!
So after two weeks solid of ringing the broker (insurers refuse to speak to me directly) I finally got a statement from the broker that the claim is closed. As explained above, the other person simply never responded to any letters my insurers sent to her.
So I thought, fantastic, marvellous news, now I have freedom to get quotes come renewal time... The person I spoke to promised to send out a letter confirming the claim was closed. So fastforward four months and they send me out a renewal quote along of course with a statement of my no claims discount - which states the claim is still open! I was outraged, so I wrote to them in no uncertain terms demanding a letter confirming what I was told back in March (i.e. that the claim is closed) and to have the renewal quote recalculated.
They replied with a letter confirming the claim is closed, and then they rang me with a new quote (which was €500 less than originally quoted - yes €500!). I immediately asked for that quote to be sent out to be in writing, together with a fresh statement of my no claims discount, clearly showing no open claims. Now, a week later, I still haven't received this documentation.
I've just had a very frustrating conversation with them where they've promised once more to send out the documents. The person I spoke to didn't seem to understand the importance to me of getting the official no claims discount document and I have my suspicions I'm just going to get another letter stating the claim is closed. I want the no claims document so I can be get quotes off other companies - after all, you need to send that in when you get a new policy, and the only document I have from them says I have an open claim. I think if I were an insurer I'd want the proper document, not just a letter.
Anyone else had this kind of experience? I'm so frustrated by the whole thing, at this stage I'm thinking of switching providers even if it ends up costing me a bit more...
I also want to write to both broker and provider and ask for all the information they have on me - has anyone ever done this and was it helpful?
Thanks guys for all the advice so far, and sorry for posting a mini-novel!