Confer with an attorney
If your sales contract states XYZ builder is now building ABC IF NO signed amendment between you and builder based on signed sales agreement builder must construct home you agreed to.
No one can render an opinion unless entire contract is reviewed.
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By the way the builder's rep may not be the person to speak with. Start with them, but they did not sign the contract, so you may need to speak directly with the person who signed the contract.
A few months ago, one of my clients went through the same thing with a builder. He eventually went to his bank, found that his check had not yet been cashed (it hadn't) and immediately cancelled the earnest money check he had paid the builder. Prior to this I advised him that this left him with clear liability should the builder choose to force the issue. Fortunately, the builder never even called him back about the cancelled check. I think I would seek advice of counsel ASAP since you're not clear on the terms of the contract you signed.
I would like to tell you different, but with every builder contract I've ever worked with, I doubt you have many options at this point.
Joe is on the mark. Refer to your agreement for specific information for this. We would also consider putting the builer on notice by a certified letter regarding your concerns and that you are consulting an attorney.