why i got 14 baned days of my account?

I haven't logged into my account for four days. I logged this morning and found that I received a 14-day baned on login. Why ? Is it because I paid a lot of riot points to buy K/DA skins? And from July,i have benn logged in Four different countries, Liberia、Ghana 、Italy and Sudan. Is it had influence of my account?
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