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Thank you for your patience. It depends on the terms of an NDA. Ideally, it should state that any invention based on the information you disclosed to them is yours.
There should be standard caveats stating that if they can prove that they had been in the possession of the information you disclosed to them before the date of the NDA, and can prove this with strong evidence, then obviously the information you disclosed to them were not confidential (exempted from the NDA), as they were in receipt of them prior to your disclosure.
In terms of your question, it comes down to a commercial decision, not a legal one.
If JustAnswer proposed a call, at whatever price, you have a choice to decline it. or accept it. If you did not accept it, you will not be charged.
I hope this somehow helped. Feel free to come back with anything else. I will be happy to assist.