I had Royal Mail collect 5 parcels from me on Monday

I have a Munbyn label printer at home, I am very proud of it and I print and put the postage labels on myself.

This doesn’t stop the postman turning up with labels every single time I choose collection 

On Monday it was a new postman and he has ignored my labels and stuck the labels he brought with him on each parcel

I know this because today the first buyer has told me they have the wrong item, the parcel has turned up at the wrong address with 2 different labels on it!

So how do I turn off the option for Royal Mail to bring labels every single time they collect parcels?