Why am I getting emails urging me to file months after I filed through Intuit/Turbotax??

Many users have more than one account.   If you started a return in another account and switched to a different one to prepare and file your return, the "old" account might be generating the messages.   Since you know you filed your return and received your refund, just ignore the emails the same way you ignore any other unwanted emails.   (And...no, TurboTax accounts do not "know" about each other.)

Could be many reasons.  Like if you have another account.  Or if you filed using the Desktop program then Turbo Tax Online version won't know you filed.  It could be just marketing.

Did you efile or mail it?  Maybe your efile didn't go though and was rejected?  

When you efile you get back 2 emails. The first email only confirms the transmission. The second email says if the IRS (or state) Accepted or Rejected your efile.

When you log into your account you should also see the status and if it was Accepted or Rejected, Started, Printed, Ready to Mail, etc. What does it say?

How to view all your accounts
https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/many-intuit-accounts-turbotax/L9aVfKS1Z_US_en_US?uid=ll5g6zcx

It's common to end up with multiple accounts. First LOG OUT of whatever TurboTax account you're logged into right now. Then use this TurboTax account recovery website to get a list of user ID's for an email address. Run the tool against any email addresses you may have used
https://myturbotax.intuit.com/account-recovery/

Thanks for the help.  It appears I do have 2 accounts.   The one I haven't used since 2013.

Is there a way to delete this post so I don't keep getting notifications and waste peoples time answering?

You should leave the post. The answers might be of value to other people with a similar situation. Anyone else who might answer will see that the question has been answered, so they won't waste their time if they have nothing new to add.