I have recalled S/N powerbank which was bought in another country Anker shop. Unfortunately Anker doesn't allow me to participate recall because I have no buy p

I have recalled S/N powerbank which was bought in another country Anker shop. Unfortunately Anker doesn't allow me to participate recall because I have no buy proof. How many people keep those for powerbanks? They have Anker stores in my country, however there is no way to exchange it in any way. I would be happy to at least have some discout on a new bank, but no.