I know that Sue (paddysmum) has just moved her dog from petplan to axa cos the 5 that petplan were taking for an excess was crazy.
I think you must have filled something in wrong for Monty and it worth doing a completly new quote and then playing with it..............say start with a younger age, no pre-existing conditions and then gradually bump up the age and if its looking consistant, then add in the pre-existing condition bit.
Make sure you have moggie or equiv in the breed cos pedigrees bump the price up.
Just try testing things to se what happens and report back
I agree with Rosella that that quote sounds far too high and if there seems to be something going wrong as you test out various quotes then ring them and tell them you have tried doing a quote on their website and there is xyz problem and can they help and am sure they will look at it if you keep the quote reference. Make sure you save the quote.