Deposit refunds, what do you do?

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We were sent a letter from our Electrical Company saying that the deposit we paid to open up a new account a year and a half ago, was being refunded ($118.54) . I was going to request a refund check then thought, maybe I should just leave it in there as payment for the following month or two. What do you do if you were getting a refund for something like this? Would you request a refund check or leave it in there and use the funds towards the next months bills?