Hi,
The C79 will only be produced if the import declaration was made and your EORI number was used on the import declaration. Without the evidence of a C79 Certificate you would be unable to reclaim the import VAT as input tax on your VAT return.
We would recommend contacting the import agent to see if an amendment of the import declaration is possible so that a C79 can be generated. If it cannot then you should contact our import and export team to see in which scenarios an import declaration can be amended.
Imports and exports: general enquiries
Thank you.