hi tommy
the same thing happened to us last year!
(dnt suppose u booked your sun hol at a parkdean camp did u?)
they took the payment twice and it put me in a bit of a mess with other outgoings etc thru the bank
ring them up and ask to spk to the manager
threaten to cancel your hol if not refunded for the 2nd error payment
oh and btw, for the hassle i ensured i got a free top of the range upgrade to the newest caravan on the park for the hassle
make sure u get something along these lines mate
hope this helps
steve