(I hope you don't mind, but I am going to be a little more stringent in my English here.  One thing we are taught in high school, keep the verb tense constant.  Unless there is a pressing need, the verb needs to reflect the time.  Using the word "So", "and" or "but" to start a sentence creates a fragment.  "No way" is a colloquial way of speaking.)

We bought a water pump on Taobao a couple of days ago. It was a high-powered model and generally useful for our needs. But with the passage of time, we found the noise not only annoying but worrisome, so given the noise level, we decided to return it. The service department refused, however, in other words, "no way." I resolved to pester him if need be. I knew it was not easy for him to accept such demands, but I felt I had no choice.  The water pump ran a little expensive, we couldn't keep it, especially if we had no use for it.  As a last resort, I gave him bad review. He emphasized it was not their fault but he understood just the same.  While they said they could accept the return, they couldn't grant a full refund. Perhaps my comments will influence his credit rating. I felt it wasn't fair, to me and also him. I didn't know where things went wrong; I just got angry and then upset about what happened on this stupid day.

March 22, 2011 Why are you so angry?

We bought a water pump from the online store "Taobao" a couple of days ago. It is high-power and helpful. But later we have found that it is too noisy. The more we worried about it (better with: the water pump), the more noisy it felt like. So, we have decided to return it, but the customer service representative at Taobao said no way. Then I had to talk to him the representative again and again. I knew that it was not easy for him to accept such kind of requirements, but I had no choice, because the water pump was a little expensive to us, and we can't keep it for no use. At last the end, I gave him bad comments through the Taobao evaluation form. because That was the last thing that I could do. He (better with: The representative) emphasized that it was not their (who is their??) the fault of Taobao, but they understood me my situation. They could accept the return but couldn't give me back the whole money. And Perhaps my comments will influence his credit of service. I felt that it was not fair, to me and also to him. I didn't know which part was wrong. I just got angry and sad about what happened on this stupid day.

P.S. 
Well, at least you can return the goods and obtain a credit for your next purchase.  Next time, however, you need to be more careful before purchasing something. 
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Good day.  /  祝 是日安好。