And if not, then take it as a lesson to always get a price locked in writing/contract. If there is a contract, chances
are there was fine print that allows the company to change your cost based on inflation, cost of materials, or whatever else they deem necessary.
You mentioned that they didn't communicate the price change though, so that is horrible on their part. You may have grounds for being able to pay the original price as a result. I just don't know legally what they can or can't do when it comes to changing the price and not communicating it.