Business ProfileforBrim Financial

I have been trying for 3 months now to resolve a missing payment for my Brim financial credit card of $8,000 without any progress and barely any communication other than generic responses from their call center to date (I have told them to get a manager to contact me to escalate this and still no communication from a manager). This is not only beyond frustrating, but it is obviously hurting my credit score as the $8,000 has been accumulating interest. My fiancee and I used **** to make the $8,000 payment on May 29, 2023. We contacted **** and they confirmed on their end the payment was processed through their systems 24 hours after on May 30 to the correct Brim account number, and **** are confident the payment was made based on their information they see on their end. We even followed Brim's instructions and sent Brim a screenshot of the payment made to their support email. Additionally, we had made a previous payment with **** to Brim with the exact same accounts and had no issues. **** launched an investigation with Brim to figure out why our payment we made was not received (following Brim's own advice to request **** launch an investigation). From the last update we have from ****, they have not received information from Brim and are being ignored. I cannot fathom how it is taking this long for Brim to resolve this issue that seems relatively straight forward, and how they are not communicating updates to me at all. They do not seem to care about hurting my credit score or caring about me as a customer at all.