Refund 退钱

The air-conditioner broke down right after I bought it.
那台冷气，在我买了之后马上故障。

Mum suggested that I should get a refund on the air-conditioner right away.
我妈妈建议我，把这台冷气拿去退钱。

I won't buy their air-conditioner if they hadn't guaranteed a refund.
如果当初没有退钱保证，我不会买那台冷气机。

I cann't believe they backed out on their words. How I wish I hadn't bought their air-conditioner.
难以置信的是，他们居然食言。我真希望我没有买那台冷气。