Dear Mrs/Mr(wpisz nazwisko jakie ci pasuje)

I am writing in connection with your e-mail regarding

complaint against your order of a cake. Please accept our sincere apologies for this

misunderstanding.

The reason of it follows from system of collecting orders.

Document are passing on between different divisions of our company

and it probably caused that you have received product with number

19 instead of 90.

We are taking care of opinion of our customers so we are working on

improvement the flow of information in our company to avoid this kind

of situation in the future.

In return of our mistake we will send to you right cake for free.

We can also offer you 10% discount for all our products to the end

of the year.

We hope you will use our services again.

Best Wishes,

XYZ