Is it legal for a bank to put a limit on your ATM card without your consent?

Hello.  All banks place limits on ATM (withdrawals).  Those limits vary by bank, by type of accounts, and numerous other factors.  You state you did not 'consent'.  When you opened the account you would have signed many documents, some of which pertained to ATM card matters. Issues with banks is not an uncommon legal problem brought to an attorney for private counsel and advice.  If you feel some sort of improper discrimination (i.e., you were wrongfully singled out for some improper reason) is happening to you, certainly pursue private legal advice from a qualified attorney.  I recommend you telephone several attorneys, because it important you feel a sense of great trust.  All the best.