The Beijing train ticket to Dingzhou I booked in Beijing was refunded to me, but the full amount was not returned.

This is for sure, and now refunds have to deduct handling fees, and I feel like ten thousand horses galloping about this policy in my heart...

Refunds require a handling fee. If there is no full refund, the handling fee will be deducted. I hope it can help you. I hope you can adopt it.