i have the same problem, i have been waiting around 02 weeks since the membership order made, Apply does not approve the payment and just sent support message
"I understand your concern and apologize for any inconvenience it might have caused you.
However, your membership is not activated because we have been unable to obtain payment for your recent Apple Developer purchase. As explained, we have escalated your case to our senior Advisors and they will follow up to assist you as soon as possible."
I hope they can resolve soon for me. it is strange with the words that Apple says for 48 hours to complete but it does not
Sang N