Hello there, I faced billing problem, now I am in China I really want to sole this problem, but I do not know

Hello There:

I am facing billing problem, I made the registered in the UK, but now I am in China, I was trying to upgrade the apps but it shown me my bank was diclined

now I really want to sole it down but do not know how, so could you help me to sole this problem?

Best Regards

Chenglin. Song