Never give an offer "based on advertised" details. Always verify in writing.
Was there a seller's disclosure?
Did you use an agent?
I am going to guess the answer is no.........this is one reason why it would be good to have someone on your side looking out for you.
Not sure what your full question was, as it was cut off, but I wish you all the best in resolving this!
Based on the exact circumstances, your best option may be contacting an attorney.