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No, that's not going to work because that's part of the error/mistake they made. You would have to have proof of payment - - like a processed check or a counter receipt showing payment in full, etc.
I hate the news isn't better, but the law doesn't allow unjust enrichment - - which is when someone acquires property/assets without paying for it.
I understand that and I'd feel the same way! I wish the news were better.
Also, if you have any other questions, just let me know. Here's my link: http://www.justanswer.com/law/expert-kirkadams/