How about charging Beijing Tianji mobile phone? Is it safe? Who tried?

On May 30th, 2009, I slowly filled the website of Beijing Tianji Yilian Technology Co., Ltd. with 200 yuan, and the delivery amount was 192 yuan. At that time, I received 1 RMB 100 yuan and three 30 yuan RMB, totaling 190 yuan. After a few days, I never filled the remaining 10 yuan. After inquiring, I said that I had returned it. I found 9.6 yuan's rechargeable coins in my account on the charging network. I really don't understand why charging the phone bill is not a complicated matter, and why the remaining 10 yuan has not been charged for such a long time, and the refund has to be returned to my bank card (I paid from it), which is inconvenient for me to use. I wonder if I did this on purpose. All the unpaid money was left on their website. That's terrible. I want to return the rest of the money that has not been recharged to the bank card. I don't have much money alone. If there are too many people, there will be problems. It's not safe.