If you're still missing the Apex Coins you've bought, then you'll need to reach out to our live support team so they can help you get those coins:
https://help.ea.com/en/contact-us/
Just note that they'll need to see valid proof of purchase (They won't accept mobile screenshots, unfortunately). This article shows exactly what they'll need:
https://help.ea.com/en/help/account/how-to-provide-proof-of-purchase/
They should be able to help you without too much bother.
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