how to redeem refill card into my account?

magenta_dt

    hi and sorry for my english. I'm visiting form germany.

    since 2014 i buy a 50$ refill-card and purchase 7GB - 30 Day 7GB On-Demand Pass

    (I bought a mobile hotspot device and set up an account years ago)

     

    this year something is wrong.

    i keep getting

    Error

    Sorry, there is a system error and please try it later!

     

    i can see my puchase history but there is no button to redeem my (already purchased) refill card...

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