Why am I not able to get refund on last purchase of $35.99 for app that I thought was a trial? I was just viewing it with no intentions of buying!

Did you cancel the subscription, then request a refund that was denied? If you didn’t do that yet go here→Subscriptions and Billing - Official Apple Support where you can do both.

Your next step is to click on Get Support at the top of this page and navigate the menu to iTunes & App Store support to contact a live human being.

I'm not sure why you were trying it if you had no intention of buying it but when you did so you should have received information from the developer laying out the terms for testing it, the cost of a subscription, etc. If the term was 3 days and you deleted the app/cancelled the subscription on day 4 you were past the trial period.

You can call AppleCare and ask to be transferred to Customer Service and see if you can get a one time waiver of the policy.

On the first link I posted you should see this→Request a refund for apps or content that you bought from Apple - Apple Support

Deleting the app does not cancel the subscription. So click on the link that I posted, then use the links on that page to cancel the subscription and then to request a refund.

That’s good; if it doesn’t have a Cancel button and only offers renewal options it has been canceled. If you were charged you can request a refund with the link on that page.

You may have cancelled after the trial period ended. Was it 3 days?