Not sure if some arabic hacker patched something in into the Xbox network to lead to a scam screen on the platform or if this is just a store bug on xbox side...
But fact remains that my console is set to english and german store region and I for sure won't buy silver as long as the store displays a language I can't read.
You might want to get in contact with Microsoft, Bungie.
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Can you please record a video of what you're seeing for use as a bug report? When I go to the Store tab and use the BUY SILVER button, it takes me to the proper webpage in the proper language.