I still have my EDM, issued in September 2020 and named "Transportation Credit Voucher", so it should be valid until Sept 2022. I did get the 10% extra value.
I see that we can actually get the money back (minus the 10% bonus) as per
https://qatarairways.zendesk.com/hc/...nded-for-cash-
Anyone has been down that road before? is it quick and efficient?