Sodexo — Balance withheld during dormant period has not been credited after reactivating Sodexo account

I am a Sodexo user. My account was dormant for a year between October 2020 and October 2021. While my account has been re-activated now, I still haven't received the balance which was withheld during this period. I have tried reaching out to Sodexo through their customer care services, but the experience has been very frustrating. I haven't received any response from Sodexo so far. I want a refund as they have wrongfully withheld a portion of my hard-earned salary without my consent.