I'd like to return this.

I bought the wrong size.

我想退货。

我买错了尺码。

I found a stain here.

在这儿我发现了一个污点。

It's broken here.

这儿破了。

It doesn't work at all.

它坏了。

It broke after I use it only a few times.

我用了几次它就坏了。

I used it properly.

我是按正确方法使用的。

I think it's a substandard goods.

我认为这是次品。

It can be refunded² if there's something wrong with it.

如果质量有问题，可以退款。

How long is the term of service?

保修期是多长时间？

Did you bring the receipt with you?

您有没有带收据呢？

Here is the receipt.

这是收据。

May I have another brand instead?

可以换另一种牌子吗？

You can't return it,because it's 1-day past due.

不能退了，因为已经过期1天。

I'm afraid we can't refund¹ you after it's washed.

恐怕洗过后，我们就不能给您退款了。