Sony *****s you money!

I play games on a PS4, and I always use discs to avoid issues with digital. The one time i purchase Add-ons for a game from the Playstore I have a major issue, I paid for the product and downloaded and installed it and IT DOES NOT WORK, When you strat the game it simply says NOT INSTALLED, i have tried to contact Sony and Bethesda with no luck, I tried every self help and quide to fix the issue with no luck, I went to Sone Webside to request a refund and they refuse to give refunds. This is ********. How many millions of people go through the same issue, and SONY just gets away with it? They are ******* and common ******* in my opinion. I will never purchase another online or digital product from them again.