It's never a good idea to threaten legal action when you have no intention or the ability to follow through the threat. Much better to be polite when looking for help.
Nor is a great idea to make claims about them breaking agreements with no idea what the agreements actually say. The T&C's actually give them pretty much zero liability to you whatsoever.
The above section 12 about intellectual property right isn't actually the applicable/relevant section of the T&C's for this situation.
Right off the bat in the in the very first section:
1. GENERAL USE AND CHANGES
The Service is licensed, not sold, to you. Plarium reserves the right to refuse any user access to the Service without notice for any reason, including, but not limited to, any violation of the Terms. You agree that Plarium may suspend or discontinue the Service (or any feature or Mobile Application thereof) or change the content of the Service at any time, for any reason, with or without notice, and without liability.
to ram the point home....
5. VIRTUAL CURRENCY AND GOODS
......You will have no right or title to any Virtual Goods and/or Virtual Currency you acquire......
Plarium has absolute control over all Virtual Currency and Virtual Goods and at any time has the right to change the value, modify, and/or eliminate any Virtual Currency and Virtual Goods as it sees fit and without any liability. Plarium's obligation to you regarding purchased Virtual items will be deemed performed upon transfer of the Virtual Goods and/or Virtual Currency to your Account.
9. DISCLAIMER OF WARRANTIES
THE SERVICE IS PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS AND WE DO NOT REPRESENT, WARRANT, OR GUARANTEE THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, VIRUS-FREE, OR THAT DEFECTS WILL BE CORRECTED
15. APPLICABLE LAW AND ARBITRATION AGREEMENT
These Terms and any action related to these Terms will be governed by and interpreted under the laws of Israel.
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The last one is the kicker. Cause unless you live in a region where there is specific local legislation that would allow you to bring a legal case in your country of origin, you would need to take your legal case up with them in Israell.
Good luck trying to sue a large corporation with deep pockets in a country that might be thousands of miles away from you, in a legal system you don't understand. That would be pretty hardcore even if you had serious resource to throw at it.