Real Estate Law
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Hi and welcome
First of all, you are correct. All transactions for the sale of land must be in writing to be enforceable. So no subsequent oral "agreements" are enforceable.
Send them a certified letter RRR telling them they are in breach of contract and demand all money owed. Sue them for breach of contract for the sale AND bring proceedings to evict them as tenants. You will eventually get a judgment and the marshal will put them out on the street if necessary.
Remember, this is not legal advice. Contact an attorney in your area. The best source is Martindale=Hubbell (Martindale.com). This is a reference guide we lawyers use to locate other attorneys by specialty and geographic location.......highly rated, not just a book where attorneys buy advertisements.
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