"Miracle stones" supplement fertilizer

I recently bought a 50kg bag of 3:2:1 fertilizer and a 50kg bag of LAN from GG

I have now spread part of the 3:2:1 on the lawn. The actual fertilizer has now been soaked into the lawn, but hundreds of tiny stones have remained behind. I took a 500g sample from the bag and separated out the stones. The sample was found to contain 100g of stones. This means that in a 50kg bag, there are 10kg of stones. Can you please contact your supplier and ask for an explanation for this ********** behavior. I have not opened the LAN yet and sincerely hope that I don’t find the same issue.

Supporting pictures available show the 500g sample and the 100g stones that were extracted.

I expect a reply to my mail and what you intend doing to rectify this situation.