Content:

The message of letter is clear. Maybe in the last paragraph I would add some threat to the company.

Structure:

Your structure is very clear and logical. But in the future you can use some linking words, which
can reader help understand the structure of your complaint.

Style:

 You used appropriate formal style of the complaint letter

Vocabulary and Grammar:

I like the wide range of your vocabulary and I suppose your grammar is fine but I found some minor
mistakes, which I marked in the text below.


Formal complaint over order ABCD1234

Dear Sir or Madam, representative of Alza s.r.o.,[---1]


I am issuing a formal complaint over my purchase, order ABCD1234. The item ordered in this purchase
were CX-H300 Sennheiser headphones. Instead, however, not only have I received a completely
different[---2] , but also dysfunctional product.[---3]


The headphones were supposed to be delivered to me on 5^th of November, and while delivery was on
time and all in order, when I opened the package, I discovered that I have received headphones
completely different from the ones that I ordered. [---4] Upon further testing of received product,
I also discovered that the headphones failed to produce any sound and therefore are probably broken
beyond repair.


I request this situation to be resolved as soon as possible. Simply delivering my original order
will suffice. [---5]


Thank you for your time and I hope we can resolve this situation soon.

Best Regards,

Jakub Abcdefgh
________________________________

 [---1] [---1]Just Dear Sir or Madam is more clear


 [---2] [---2]A completely different, you miss some noun (headphones)


 [---3] [---3]Without instead, however the sentence is more clear


 [---4] [---4]Too long sentence. And I supposed the date is not neccesery


 [---5] [---5]I suppose will suffice is not formal ,(use: will be  sufficient/adequate