What recourse do I have against a used car dealer who cannot produce the title to my purchased vehicle?

Question Details:

A little over 2 months ago we purchased a used van from a local dealer. We paid in full by personal check. Since that time, the dealer has not been able to produce the title. We have put some money into maintenance and insurance. Should we ask for a full refund of the purchase price plus these amounts? The reason they have given me most recently is that the title had a lien on it and they had to work with the lien holder to release the title. I was told about 4 weeks ago that everything was worked out, however, still no title. I want to resolve this and need to know rights. What actions should I take?

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