I am looking for someone in Poznan who can visit a address to collect outstanding documentation from a designer who is ignoring contact. I am happy to pay a fee to any person who is able to convince the individual to contact me directly and provide the outstanding work that has been paid for. There is a balance due to be paid to the designer once all of the documents have been provided.
I agree with the lapine poster; it is unlikely to help. Did you sign a contract for the work? Unfortunately in Poland, if there's no written contract, it simply didn't happen. Did you commission the work through one of those online portals? If so, that might be the way to go.