No invoice at 0% vAT

Hello everyone!

I recently bought two gift vouchers from Mediamarkt. Gift vouchers are subject to 0% vAT, which is why they refuse to issue an invoice.

I have called and emailed several times, but unfortunately to no avail.

If no vAT has been charged, is it sufficient to include a receipt for the purchase in the accounts? My vAT number is also not stated on the statement.

Thank you in advance for your answer!