✔ 最佳答案
It seems the three sentences do not connect each other.
1. 現附上副本銷單收據給妳
I hereby attach a copy of the sales receipt for your reference.
2. 煩請告知客人是否直接去COUNTER辦理退款?
Please advise your client whether to get the refund directly from the counter.
3. 有關退款我將會問貴公司會計部處理
I will ask the Accounts department of your company to handle the refund.