error: "You have reached the maximum number of credit cards allowed on your account"

Hello all,
It is really uncomfortable with the system. I bought a SIM card with the support from my friend (we used his card for the payment). Now I active my Sim Card and Make a Monthly plan. However, when I add my card for the payment, the system refused and show: "You have reached the maximum number of credit cards allowed on your account".
What is that? I just added the second card for the payment. It's really bad and make me crazy.
Please give me some advice.
Thanks!

Answers

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