Buffalo city municipality not willing to assist with refunding me after sending me a letter to request for the refund

I have been trying to get help with a refund as I have over paid and have contacted the municipality from 2023 and no one was willing to help. Eventually I dealt with Ndileka Xuza from Bcm and provided him with the relevant documents in February 2026 and still have not received any feedback to date. It's not a small amount (pocket change) that I can just let slide.