Ive been mis-sold with holidays package. Where I can found

I've placed an order for package holiday scheduled on
10/12/2013-20/12/201 on Holiday Gems
website on 14/09/2013 providing retailer with my HSBC credit card details.
Booking Ref: S6886/67189. Total displayed package cost was £936.85 . On 16th of September I've received call from booking agent with question if I can fly
from another airport. I said yes if she found any cheaper flight. As no cheaper
flight has been confirmed, I've asked to leave my booking unchanged. On 19th of September I've received email from Holiday Gems with for attachments:
Voucher for transfer, Accommodation voucher, Flight details with booking ref,
and thank you letter for booking. On 20 of September another email saying all
other required travel documents will be dispatched 7-10 prior to travel plus 6
attachments: Thank you for your booking letter, Holiday Gems LTD Conditions for
Agent Booking Services, Travel Itinerary , Booking confirmation, ATOL Receipt
For total cost of Holiday £1,089.14 which was 16.26% higher my booking price
& ATOL Certificate confirming that my money is protected by ATOL
scheme.
As I was monitoring flights and same package prices since my
booking and actually they never go up, naturally raised the question what is
additional price for. I been trying to resolve price rise by email [email protected] on 29th of
September, filled in inquiry form on their website on 6th of October
and had no response. After made calls to customer services on 23 and 29th of October, but I was told my agent not in and no one can help, I asked to
leave the massage to call my back, but my agent failed to do so. I noticed that
I was simply ignored. On 9th of November, over four weeks before
scheduled Holiday I posted with signed delivery Contract cancellation letter as
major price increase by 16.26% breaches
the terms of my contract and have not been contacted with any contra argument,
naturally I may think that my cancellation has been accepted. As no any contact
since then has not been made, I did not received any travel documents and no
refund I would like to know if any action could be taken to get my money back.