Suit for quiet title advice needed

[Gaynor Pendleton]

When I purchased a block of land I was given a Special Warranty Deed at settlement. Am currently in the process of selling. When a search was conducted by the settlement agency, it was shown as being sold as a tax Deed and the buyer has requested a "Suit for quiet title" as they say this is the only way to attain a clear title. Is this correct? Any help advise on this would be appreciated and how I obtain this, and approximate cost. Thanks.