If there was no written contract, then you would have to defend the amount of the oral contract you have against their suit. You should pay them the agreed upon amount and then let them sue you for the difference, since there is an agreed upon amount you are stating. Put on the check, "payment in full for services" and send it to them as you agreed, if they have additional charges, let them sue you and prove there were additional charges agreed upon, which they will have a pretty tough time doing without any written contract.
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