Thing is if they gave you a name out a hat on their supplier list could you prove them wrong ?You may be right, but we don't need end users making claims that cannot be substantiated.
I am selling a high quality product that is traceable to local people.
These people are selling a similar product (and probably buying it cheaper) and claiming that it is the same as mine.
This eventually reflects badly on all genuine suppliers as when people have a bad experience they won't buy lamb, beef or pork etc because it was a bad eating experience. Many won't remember the brand but that it was a Shepherds Pie with lamb in it.
I am not bothered that they won't be able to tell me the name of the farm, but I really would like to know if it came from NZ or Wales and why they don't buy locally.