[WLT17]

Yes. But they are saying the wrong items i bought are not actually shipped from their warehouse.

Then what do they mean by this?  Namely "by the brand I bought".

were actually not shipped by them but by the brand i bought

Also saying i need to sign the affidavit for them to conduct a investigation with DHL.

Although It may only be required to move forward with the claim, due to the nature of an affidavit, I always suggest not to sign It.

They said the wrong items are shipped by the brand themselves, not them.
Yes, i will avoid signing it, will attempt to liaise, if unsuccessful will just return.