Recommendation for buying RP in client

Hi, I love this game but some limitations (in client) are started to boring me. Example "You have exceeded the maximum number of attempts at this time" limitation... I submitted many tickets about this issue but it's coming again without stop. (I have currently too) I can't understand why I can't buy RP when I want as customer? Why client thinking my credit card security more than me? Please Riot make this security limitation as optional in account options. I can secure my card myself. And when I research in internet I saw many people had this issue. I think it will be helpful for community. Thanks.
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