I posted a parcel off ,simple delivery with Royal Mail,then next day printed the same label by mistake for another parcel. I immediately messaged both buyers to let them know. The first buyer said she will do as suggested and refuse delivery of the 2nd parcel ,so it is sent back to me and I can send to the correct buyer. The first parcel was delivered and the 2nd is due tomorrow. However, I noticed that both tracking numbers were the same.| rang Royal Mail and they said "an admin error" and weren't that concerned. But surely this is wrong and should be looked into. The 2 parcels were posted a day apart in different post offices in different towns, so how can this happen . I have noticed someone else on here had the same problem. so not just a one off and could be happening regularly.