Advice

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My maintenance company for my housing estate has issued me an incorrect invoice showing I was in credit. I asked for my next quarterly bill to be deducted from that credit, (I bank transfer them when payment is due). They have responded saying there was a system error & that I do not have credit. They have now issued me an amended invoice that shows no credit & that a payment was due. I have repeatedly responded to their emails refusing to pay anything until this credit is fully used, as this was their mistake & not my fault. Can I refuse to pay any further charges/bills until this credit is used, as I still have the original incorrect invoice?