Your bank can change the effects of an oral stop pay, but you will need to review all of the documents where it is mentioned and bring their verbiage into line. Confirming an oral stop payment in writing is a "best practice" in my opinion, but this would make it even more important.
However, ff you have advice from your bank's attorney, I suggest you take it or ask for a second opinion rather than shopping it here.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.