Rp not updateing bug.

When i checked on my RP i noticed after purchasing Zac and Brand i still had 1025 RP, i noticed that Darius was on sale this week for 487 so i decided to purchase him, after my purchase it said i only had 52 RP left so you can see my confusion. The RP either didn't update after my purchase of the 2 champs or, i was overcharged but either way this is a bug that needs to be resolved, i was planning on getting lumberjack Sion now, sadly i cannot. I would like Darius to possibly be refunded for me since because of this bug, i was not aware of the small amount of rp left in my account, and i used all my initial refunds on previous champs i ended up disliking. Thank you.