How to solve the shortage of in-apps purchases?

Question

iOS

There was a big difference between our purchase stats (flurry, GA, server) and Apple's stats (read paid purchases). Approximately 70% of INEPs were not paid. Well, not 70% of us have jailbreaks? or maybe?!
Sales were almost all in Russia.
Support replied that they had no failures, and the statistics of third companies are not evidence for them.
Questions:
Did anyone come across?
How to resolve the issue?
What could be the reason?

Answer 1

I faced this issue. there really is a problem. I described the solution to it in an article here .
The protection actually works. even in light of the latest news .

Answer 2

Is there any statistics on how many unpaid purchases per user? Those who install the in app cracker will soon be buying all the in-game stuff they can.
You can fight with the help of an additional verification of the purchase after payment.

Answer 3

Sales were almost all in Russia.
It kind of hints… I heard that there is such an application as a DLC that can bypass in-apps purchases.