App Store subscription billed 5 times, still no active subscription

I tried to sign up for a premier subscription to a karaoke app. The first time it did not go through so I updated the card details. The second time the app store stated that the charge was successful but then the screen changed to “something went wrong”. So I changed the credit card in my account and had this issue repeatedly. Now I have one charge on one card and 4 on the other! For the same subscription. In the meantime I do not have access to the premium features in the app and the app is not in my list of subscriptions. I called Apple support yesterday to discuss and they said they understood that I only want one subscription (obviously). Today I got emails saying that I was not eligible for a refund! It is impossible to have 5 subscriptions on one app so this is maddening to say the least. Had no idea that Apple could behave this way. This is a very clear cut issue but they seem to be trying to charge 5 times for one subscription!