How long does Redensity 2 under eyes last?

Dear Doctors, I had under due redensity 2 filler done 13 months ago, by needle. I had a darkening of my already purple/black dark circles immediately after the procedure and I am waiting till that day for the reabsorption. After 13 months still have a darker color under eyes. How much longer am I to be kept waiting for the complete reabsorption of the product. Is possible that, if put in the wrong place, redensity 2 could last years? Thank you