Aha - step into my office.....
Having had the mother of all battles over a so called "pre-existing" condition, I think I'm quite well qualified to comment here!!!
Cockahoot, you may not be aware of my mammoth battle with Tesco pet insurance over an enormous bill which they refused to pay because of a so-called "pre-existing" condition, but believe me, I've been there and not only got, but hand woven the t shirt!!
The down side here is that any treatment your dog has had so far (prior to the tear-duct diagnosis) has not been successful. This makes any attempt to argue that she has a "new" condition pretty hard to prove. However, all is not lost! Although your new insurer is telling you to take a running jump, you MAY be able to claim under the original Pet Plan policy. Provided the condition did not manifest itself within the first 2 weeks of the cover, then you should find that in the small print, they are liable for any claim that STARTED within the time that their policy was active. This is well worth looking into, especially when trips to the specialist are involved.
If you want, please PM me and I'll tell you all about my battle royal and my successful outcome
and I will happily share with you any crumbs of advice I can from what I've gleaned so far.
Don't despair, all may not be lost.......