Unhappy Customer

The Courier Guy Somerset set west didn't do their job properly. I am selling via Yaga and send out parcel to buyer on the 10th of February. Buyer hasn't received her parcel because she says she is awaiting PIN from them, the status says Parcel Ready for pick-up not the normal status we know that Parcel is in Locker. I am honestly not happy about this and the way they are doing things.