Unable to enter 'valid' credit card number to set-up Auto-pay

magenta6224214

    QUESTION:

    Have been trying to set-up Auto-Pay. First, after many attempts through the PC-based "sign-up," I get in-only to have unreadable T-Mobile response pages flash by on the screen without stopping . Then, when I was finally able to get in through another entry point in T-Mobile's website, it will not accept my valid, 16-digit credit card number that I entered, saying it is an "invalid number." Please note, the invalid msg came up before I was even able to hit the 'continue key.' ANY SUGGESTIONS?

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