1 I'm terribly sorry to hear about
2 I'm afraid we have been having
3 I will be investigating what exactly happened
4 In the meantime, I've arranged for
5 We would like to offer you
6 Once again, please accept our sincere apologies
a a 10% discount off your next order as we value your custom greatly.
b ...problems with our inventory system recently.
c the problems you've had with this shipment.
d for the inconvenience this has caused you
e to make sure this problem doesn't occur again.
f the outstanding 2,000 units to be dispatched to you today.