Mobile Payment Issue In South Africa

So I usually purchase RP through my phone as I am too young to own a credit card and my parents refuse to buy RP with their credit cards. The problem is I cannot purchase any RP right now because I open up the shops in the League of Legends Client, select my country as South Africa and then when I look for the "Mobile Payments" option, and it isn't there. I have bought RP a few times already so I do know that the option for "Mobile Payments" was available in South Africa. I am running a repair on my League of Legends Client right now but if that doesn't work, then could any of you give me any suggestions? I would really appreciate it. :)
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