Prosze o sprawdzenie listu formalnego :-)

Customer Services Departament
Sonny ericsson Service
Gdańsk 80-555

Dear Sir/Madam
I am writing to complain about the mobile phone Ibought at your shop in Gdańsk a three days ago.
The phone worked perfectly well for the first day.I could phone,answer calls ,send messages and listen to the music.But yesterday something has happened.Battery ran down the phone turned off I cannot turn it on.Sometimes it works and sometimes it does not works.
As the phone is still under gwarantee and I would be grateful if you could consider a full refund.
I look forward to hearning from you.
Yours faithfully
XFZ

I am writing to complain about the mobile phone Ibought at your shop in Gdańsk 'a' (po co to 'a' tutaj jest?) three days ago.
But yesterday something 'has' (niepotr) happened. (brak przedimka) battery ran down, the phone turned ITSELF off I cannot turn it BACK on.Sometimes it works and sometimes it does not 'works' WORK.
As the phone is still under 'gwarantee' (ortog) 'and' (niepotr) I would be grateful if you could consider a full refund.
I look forward to 'hearning' (ortog) from you.