If it can be shown that it was misrepresented that has a good chance of voiding the "As-Is" terms of the sale. I'd document my attempts to contact the seller and after a week of no response send a registered letter to them via certified mail requesting that you be contacted, I wouldn't go beyond requesting to be contacted. If no response then weigh out whether or not it is worth involving an attorney.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer