I had the same problem for about a month. In the end, I emailed them (devpayment@apple.com) and when nothing happened after about 8hrs, I sent them message again, this time using the contact form at https://developer.apple.com/contact/topic/select (Membership and Account >> Programme Purchase and Renewal). In 4hrs my membership was renewed. I'm in Ghana, West Africa.
Hope this helps someone.
kojok
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From
Accra, Ghana