E-Mail
| Office | info@prostkey.pl |
| Export | export@prostkey.pl |
| IT Department | it@prostkey.pl |
Helpline
| POLAND | +48 87 737 12 30 |
| Customer Service | 40 |
| Structural Design Office | 32 |
| Accounting | 27 |
| Warehouse | 60 |
| HR Prostki | 65 |
| HR Szczuczyn | 213 |
