Which is better after sale, Jianyi treadmill or Shuangchao? Recommend a good running.

It's best not to buy Jianyi, because of their various defaults, I don't have much chance to know how their quality is. At that time, I bought Jane's treadmill, but I asked on the third day and they promised me that it would be delivered the next day. As a result, it didn't arrive at 9 pm, so I asked. I changed several customer services, and finally gave me a "delivery", only filled in a single number, and there was no logistics information the next night. After questioning, the customer service told me that it would take 2-3 days to deliver the goods. Finally, I chose to retire and waited for two days. During the consultation, the customer service admitted to me that the refund would be completed on the same day. I waited until after 0: 00 in the morning to ask them to give me a refund. This is Kenichi. How can the service be so good?