Charged for App that doesn't exist

I attempted to try the Tennis Drills and Tips Library - it did not show a price so I thought it was just another app you could try - downloaded the app and it says "No longer available. You may want to remove it from your Home Screen"- I have a picture of the message. Then i saw that ROKU charged me 2.99 - so I emailed and they gave the usual - "we dont refund app charges - final sale etc. So I asked the Chat Bot got the same blah blah - It is ILLEGAL to offer and charge for something that you don't / can't really offer. I cannot get anyone on the phone - and I have been a customer for 15+ years -  have not waivered. It is not the money - it is justnot legal or fair -  Please credit the 2.99 so I can continue to trust Roku.