I am receiving this error 8805

The value for the ‘Brand Name’ attribute for the SKU provided is inconsistent with the value. Updating this attribute will make it inconsistent with other products in this variation. If you wish to add this product to the variation, ensure all attributes are consistent.

If anybody knows solution to that?

We are brand owners and how is it possible that any of our product somehow got some other brand’s name while it was selling okay and we made changes to their data to.

Know no matter what changes I try to make processed file return with this error, we can’t edit, update or even delete these listings, yes, when trying to delete it via seller central, it says it will take effect in 15 minutes, but does nothing and when trying to delete via flat-file, we receive same error.

Seller support’s “support” isn’t really supporting us either, their replies are usual scripted answers, tried live support and call, but they also transfer case to "specialist team", which replies via email in typical manner.

We are stuck, please help.

Thanks and regards.