Hi
Make a list of all that you have done, the delays, the non-responce times, the promises etc etc.
And send a complaint letter to the Compliance Officer - details should be on your policy documents.
The sad thing is that Voyager is a subsidary of CGU (Commercial General Union - the name coined when NU took over General Accident and Commercial Union - those of us with experience of Norwich Unions appalling administration felt that a better name would be Commercial Accident)
This from their website:-
"This insurance is arranged with UK Underwriting Ltd on behalf of Primary Insurance Company Ltd, Indemnity Insurance Ltd and CGU Insurance plc trading as Norwich Union"
When you say the cover was arranged by a "respected booking service" - what do you mean? - was it the Travel agent?
If so - I suspect you have you have just fallen foul of the sales technigue that gets you to pay a high premium for a "so-so" policy.
If so go back to the Travel Agent and demand that they do something - it is my understanding that under the new FSA (Financial Services Authority) "Introducer" rules for General Insurance plans - if they recommended the plan then they should handle the admin.
Sounds like you have been given the run arround.
Time to start banging the table I think!