What do I do if my auto insurance cancelled me and sent me a refund, if they sent me too much money by mistake?

Question Details:

My insurance company seemed to send me my full premium back when they cancelled me, the local office is aware of the mistake, and said the home office would bill me. I have not heard anything from the home office asking for the money back. I've already spent some of the money getting new insurance etc. Do I really have to send it back? Can I keep it if it was their mistake and my policy is cancelled anyway? Or if I do have to send it back, do I wait for a official letter, can I pay it back in payments since I don't have all of it now? The home office has not told me to give it back.

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