All packs prices increased by on many countries

Look, it's very simple.
Companies are not "dicks" because they maintain a profit margin.
The reality here is that with currency changes the value of the product goes down. So they have to compensate.

Let me try to explain it another way:
The cost of the pack has not increased. It's what you are trading it for that has decreased in value.

That you're not willing to accept that doesn't change the facts.