RE: A contact said they could not see me online but I was and I did not block nor delete?
Neither will be more accurate, the Messenger servers are what gives the information to any kind of client, so until that is rectified, everything is just as innacruate.
If a contact deletes you without blocking you (and their privacy settings are set so that people not on their contact list can see them as online) then you will be able to see them online and send them messages and the messages will get through
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