I have a mail redirection applied to my previous address. Recently I received two parking penalty notifications via this service for someone I don't know who uses/used an address nearby.
I have tried phoning Royal Mail which was not helpful. They provided an e mail for complaints which was even worse saying that the e mail wasn't monitored.
How on earth are we meant to contact them to inform them of a serious GDPR breach? Utterly useless and trying to avoid any customer experience