1 I’m sorry to hear that, madam.
2 What’s wrong with the... ?
3 Can you come (in) to the store / shop today?
4 I’m calling about the...
5 And they haven’t been round yet?
6 But I can assure you that...
7 It doesn’t work properly.
8 Here’s the receipt.
9 Do you happen to remember the name of the person who served you / attended to you?
10 I’ll call our Rotterdam branch to…