I recently signed a purchase order and associated credit payment plan for Anglian Windows. The agent assured me that I had 14 days cooling-off period. After sending the cancellation request on the 14th day I have received a 'breach of contract' letter from Anglian legal department informing that 25% of total purchase price is due as cancellation was sent after the 7 days cooling off period. As the agent gave misleading advice, do I need to pay this?