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you are welcome. I am sure those accounts are using your posting authority.
Here is a nice post by @luegenbaron on how to take the necessary steps:
https://steempeak.com/steem/@luegenbaron/how-to-revoke-posting-authority-and-change-master-key

Oh! I truly appreciate it. Thank you so much. I was a bit lost as to where to start. I just downvoted their last two posts so ... it's a start! :)

a good start it is!

@mack-bot, I am explaining here exactly what you told people in your last two posts. I appreciate your effort in fighting spam, but your approach seems to be a bit too general.

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