Help with Payment/Chargeback and falsely sent to collections by QB

I've spent 20 hours on the phone with QB online payment tech support with no resolution since 2023. We've been falsely sent to collections for an outstanding balance that was an Intuit error, not ours. The client who paid their invoice using their Visa card, had not disputed the payment but rather, Visa flagged the payment with other payments made on the clients card. We provided the proof in writing to QB  on December 27, 23 with a written letter from the client that they did not dispute the payment and the funds were not put back in their account. We were not made aware of the disputed payment until 30 days after the payment was already in our bank account. We've provided all the proof Intuit asked for and confirmed they had it on 12/30/2023. We were told we would hear back from Intuit and never have. Since December 27th, we've been in contact with Ritta, Rolando, Kierra who transferred me to Alvin, Laurie, Ellan, Brittney, Justin and Samantha. Every single person has said they see the issue, confirmed we've provided everything we need to provide and that our case id would be expedited and that they would follow-up on the case....no one ever responds or is held accountable. I even have in writing from Intuit that we do not owe the debt, only to be told later that I should have never received that information in writing....any ideas on how I can get support from people who actually can respond?