Significant Price Increase from Signed Contract by the Builder

[Shannon D.]

We signed a contract with a builder 14 months ago and we just got a new price of 35% higher than what we originally signed for. They are blaming the inflation and permit delays. The exact language in our contract is: "Seller shall be obligated to complete the property no later than two years after the date buyer singes this agreement except for delays beyond reasonable control of seller caused by acts of God or other matters that qualify under impossibility of performance principles recognized under the laws of State of Florida, in which case the completion date shall be delayed by an amount of time equivalent to the delay beyond the reasonable control of seller cause by acts of God or impossibly of performance matter. " 

The builder is using this clause and wants to either cancel or raise the price. 

Has anyone had any success in this situation to challenge the builder specially with the second part of the language (impossibly of performance matter)?