I am sorry for the tardy response; are you still having issues with upgrading?
Also, have you tried doing via our plans page directly? If so, did you get an error? Would you mind sharing a screenshot?
Note that our payment options for individual accounts are credit cards and PayPal while we currently accept the following credit cards: American Express, Discover, MasterCard, and Visa.
If you're interested in getting a Dropbox Business account there are more options, but you'll need to discuss this with a sales representative. For more information about Dropbox Business you can go here: https://www.dropbox.com/business
Thanks in advance for your response and sorry if my Chinese are slightly off - I used an online translator (look below for the Chinese version of this message).
PS:I moved your post to a more appropriate section to keep things within our forums neat.
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