I do have some pictures to clarify the situation but il post these once i get in contact with a real customer support. Please notice this. And steam support basically told me to ask Bungie.
"Hello. Basically the story is : I happened to make a dumb mistake of purchasing season pass first and after that shadowkeep. But as i understand i would´ve got "seasonal pass" anyways with shadowkeeps purchase. So ive spent extra 10 eurs for basically nothing. Would it be possible to refund that 10 euros? I know that the dlc is listed above but thats not the thing id like to refund here. Ive also listed a picture of that first purchase wich went for nothing. (That 1000 Destiny 2 Silver)"
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To make sure the right rep and increase the odds of a rep responding you might want to give at least a high level overview of what your issue is.