Log into Showthemes Dashboard: https://www.showthemes.com/wp-admin/

Select Users and search for the email address. See if there is a dash (✔) under Active Subscriber? 

If it shows an active membership, then under the username, select Switch To to impersonate the user.
Under MY ACCOUNT select SUBSCRIPTIONS

Click on Subscription # i.e. #95252 and select Cancel.

The status will change to something liked Cancelled.

Scroll down to the bottom of your screen and select Switch back to your username. This will bring you back to your Admin account. You will likely get a message at the top ‘Invalid order. My account – just select Showthemes >Dashboard from the top menu to get back into your Admin account.

Once the account has been cancelled, send the canned response under Billing entitled Subscription Cancelled Confirmation (after cancelling in membership area) for Showthemes and Tesla.

Note:  Sometimes the client has already cancelled the subscription. That's visible whenever the profile includes "Pending Cancellation" (no check mark) means that he cancelled his subscription (meaning he won't be charged next year) and/or if he wants a refund, he already cancelled his subscription himself and wants a refund on his most recent purchase.