COMPLAINTS & CUSTOMER SERVICE. 6.1 In case of complaints or questions in relation to our Service you can contact us as follows: call us on our free phone number 00 0000 000 (you may be charged for calls by mobile phone) write an email to xxxxxxxxxx@xxxxxxxx.xx; or write to us at: Bank Pocztowy S.A., xx. Xxxxxxxxxxxx 00, 00-000 Xxxxxxxxx