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Unfortunately, opposing counsel does not represent you, so his "bad advice" to you would not be actionable against him as he has no legal duty to you at all. Opposing counsel's legal duty is to his client and he is to do what he can to zealously represent his client. By the letter of the code of procedure, a court does not have to allow discovery after the discovery period closes and what was left off of that is that if you wanted discovery beyond the close of the discovery period you could make a motion to the court for leave to do so if opposing counsel did not agree to provide the information.
This is something I am afraid that happens to many pro se litigants who do not know the rules of court or rules of procedure or rules of evidence, is that they get out legally maneuvered by opposing counsel who use the lack of knowledge of rules against them. The courts hold that if a party chooses to represent themselves pro se, they are to be held to the same standards as a licensed attorney, so this hurts pro se litigants in court and I am afraid you cannot sue or take action against the opposing counsel for them providing you only half or partial information about the rules of procedure.
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