do you have original box as it should be there
Dual SIM phones have two IMEIs so make sure you've submitted the one for SIM 1. Or maybe it thinks the warranty has expired.
still looking for box
Some have the IMEI on a sticker on the back of the phone. Could be there if the phone is in a case.
found it still gonna cost me £20 to send it, thanks for your help
What's the £20 for, is it out of warranty? hat Samsung page I linked to talks of numerous options including mobile repair & courier pickup.
as far as i can make out its for collection and delivery as when i 1st had phone it was on a 24 month contract and it expires on 1st feb 2023