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Had a check clear my bank account from Denya Business Keys LLC that I didn't recognize or authorize.  Called the number and was on hold for 10 minutes and no one answered.

The same thing happened to me by the same company.  Denya Business Keys, LLC.  Called the number and had the charges reversed on May 3, 2020.

You should cancel the account, too, so they can't do it again.

Same thing happened to me!!  Did the reversed charges show up in your accouont??

That would be a lot of work to cancel the account.  If you have automatic charges taken out-you'd would have to change all the bank info :(

So you'd rather they keep taking money from you?!

A charge showed up on my wife's elderly aunt's checking account with this nimber listed on the electronic check.
Called the number and asked where this charge came from, but all they would say is that they were just an answering service, but would request the charge be removed.  Sounded fishy, so also contacted Chase Bank (1 hour hold for that), and had them remove the charges as well. FYI, Denya Business Keys, LLC. showed up for this charge as well.

Did Chase also cancel the account? If not, have them do so or this will just happen again.

Yes.