Unable to continue playing due to 'missing' dlc [PS4]

So.. I recently re-installed the DA:I's GOTY version (from disc) and everything went smoothly, but then the game stated that it's "UNABLE TO LOAD SAVE DATA AS REQUIRED DOWNLOADABLE CONTENT IS MISSING." etc, so I went to PSN store re-download the dlcs, but the store states that the code has already been used (SURPRISE, SURPRISE) and gives the error code WC-40372-6. So.. what now? The code had an expiration date of 13/10/2017 (why are there expiration dates on these things to begin with!?!), but I originally used the code in like, sometime 2015. Is there anything to fix the situation, other than 'buy the game again'?