I'm Lucy, and I'd be happy to answer your questions today. I'm sorry to hear about your situation.
The answer here is actually going to be listed in your contract. The default position in the law is that a contract is final once it's signed, and if either party backs out, the other can sue for damages. The damages in this scenario is the profit that Sears would have received if they'd been allowed to do the job, and that's something they would have a legal right to sue for if you canceled without legal justification. Buyer's remorse is unfortunately not considered a legal justification for canceling, and neither is hearing rumors about the company. If you can get some evidence that they're having financial troubles and may not be able to complete the work, you can send them a written request for assurances that they will perform. But you'll only have a legal right to cancel if your contract gives you one. It might. Read through it carefully.
If the contract doesn't say anything about canceling, you can still ask them to cancel the deal as a customer courtesy. Big companies will sometimes do that because they want you to come back with later projects, and they want you to refer them to your friends. Just keep in mind that, in that scenario, you're negotiating for a favor rather than something they're legally obligated to do.
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