Lagoon Place Self Catering Lodges - Last Minute PRICE HIKES

We booked the Lagoon Place Self Catering Lodges in Fisherhaven for the 1-3 March 2019 in Mid January with a set price and no indication of prices going up. We were asked to pay a deposit by 30 January 2019, which we did. On the day that a full deposit was paid the owners then decided to only then tell us that prices has gone up and we need to pay even more. I am deeply frustrated with this because I know that this is not how you rent a service or do business.