What to do about a self-renewing contract?

Question Details:

I bought a home from my parents that had a propane tank underground. When I called the company to ask current gas prices I found they were significantly higher then other local companies. I told them I was going to shop around and they told me they own the tank and theirs is the only company that can fill it. I brought this up to my father and he said he signed a 10 year contract with them which is fine but that was 16 years ago. I called and asked them for a copy of the contract because of the the 10 year agreement. Now they are saying its a self-renewing contract and there is nothing I can do?

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