Does USCIS send a notice if they Reopened or Cancelled previous I129 approval?

Once USCIS approved a petition I129, Petition for non-immigrant. If USCIS canceled or Reopened the approved case do they notify to petitioner by sending notice? Else they can simply cancel/Reopen the approval decision without sending any update through notice? Please advise. Thank you!

Yes, they will do that. That’s the standard process. Sometimes, there may be issues with online system, but they will usually send, you can contact the customer service again and try to figure out…