Wrong price/ amount on generated pdf gift voucher

We have received an order for a product/ gift voucher whose value is €750.
To our surprize the buyer contacted us and informed us that despite the fact that he paid €750, the value printed on the gift voucher pdf is... €270.
I checked the backend and (1) the product/ gift voucher value is ok, (2) the pdf generating template is ok and (3) there is no other product/ gift voucher into the system with that particular value (€270)
Can you please let us know what exactly could have interfered with the generation of the pdf in such a way as to modify its price?
Platform is Wordpress/ Woocommerce/ AwoCoupon v.4.0.1.2

Thanks for your quick reply, Seyi
I have sent the credentials via message.
Unfortunately we don't have a copy of the email the customer received.
Main issue for us is that there's no backend solution to see the generated pdf...

Hi, Seyi
I have run a report and there you can clearly see the order for which the client paid 768.75 Euros, but the gift certificate value was only 270 Euros.

Thanks for your quick reply, Seyi. One more thing - how exactly we can regenerate and resend the corect gift certificate pdf?
Can this be done at order level? If the order is Complete, by temporarily switching the order to Processing and then back to Complete will regenerate and resend the pdf?

Thank you very much, Seyi