First off, that’s amazingly lucky to get 3 out of 5 Epic Troops Summons being 4*. If I did the math right, there’s a 0.856% chance of that happening.
Maybe I’ve misunderstood what you meant by this, and you actually did 5 10-pulls?
Occasionally I’ve seen people mention items or troops not show up in inventory immediately, but suddenly appear after force-quitting and reopening the game. So I’d try that first, if you haven’t already.
I’d also suggest screen shotting Summons results like that, to make it easier to contact support.
And on that note, I think unless it suddenly materializes, your best next step is to contact support: