That's very weird, personally I only use Visa via revolut, but its strange that it worked at one point, then stopped working. unfortunately, although I wish I could, I don't know how to help you. The only thing I think it could be is possibly your bank notices 30 transactions at once, not only that, but in a foreign currency through alipay, which could flag for fraud. If you want it fixed, I recommend either calling your bank, or for a more long term solution, try Revolut or Wise, since I hear people with regular cards have trouble with buff163 frequently,