In light of/In view of/Considering/Seeing the fact that your expectations were not met, I'll bend the rules and give you a full refund.

鑒于...由于...

A: Hello, I'd like to return this woolen sweater.

你好，我想退還這件羊毛衫。

B: Do you have the receipt?

您有收據嗎？

A:Yes, it's in a box.

有，在盒子里。

B: Would you like to try on a larger size?

您想試穿大一號的嗎？

A: No, thanks. I just want my money back.

不了，謝謝，我只想把錢拿回來。

B: We don't provide refunds, although I'll be happy to exchange your purchase.

我們不退款，不過我很樂意更換您的商品。

A: If that's the case, can I try on a different style, please?

若是如此，請問我可以試穿不同的款式嗎？

B: Items can only be exchanged for those of the same style.

只有相同款式的商品才可以更換。

A: I don't want the same style. Not only were the arms too tight, but the body was too baggy. If I get a larger size, the arms might be alright, but the body will be even looser.

我不想要相同的款式衣服，不僅袖子太窄，而且衣身太寬松。如果我拿大一號的，袖子或許沒問題，但衣身會更松垮。

B: In light of the fact that your expectations were not met, I'll bend the rules and give you a full refund.

先生，由于您的期望落空，我這就放寬規定，給您全額退款。