I asked for a house to be built and my understanding is that it would be for 100k. This was a verbal contract. I paid 50,000. After the building was finished, the contractor is saying that the cost alone was 200k. I did not pay anything until they would take some responsibility. They have sued for fraud for the whole 200k. Is this fraud? Or is the breach of contract? As this case moves forward can they change their attack and say it was breach of contract? Can a plaintiff change their case in mid stream or they have to file another suit?