My mother and father enter the US together dad was given six months to stay and my mother was given 2 and a half years to stay we did not notice it until we was finding what need to done, to apply for she stay longer because I was recovering from surgery. We was told that she can stay as long as she leave before the day on her paper I told them the day but all they said was just make sure you made copy of the document. Now after six year they denied visa to my mother accusing her of over stay. What we can do?
There is basically nothing you can do. She might not have a ban, but they can still deny nonimmigrant visas for "failure to overcome the presumption of immigrant intent" if there is anything they do not like in her history, and they do not like someone who stayed in the US, say, 1-2 years, on a visitor visa, even if their I-94 happened to be given for that long by mistake.