Missing final bill

Hi there looking for advice on what to do about this situation as it is impossible to talk to a real person. I participated in the Bring it back program, at the end of my term I decided to keep the phone, I had went in to cancel my plan a few days after I had paid my monthly bill. I was told my the man that there would be an unused part of my phone bill and it would be applied when I received my final bill. I canceled January 11th, since then i have went in store twice and called multiple different numbers trying to get my final bill as I have sent probably 200+ to it while I waited for the bill. I have only been able to speak to a robot it will not let me talk to an actual agent, the agents in store say they cannot see my balance since I cancelled my account, but that Telus is probably behind on billing and I will receive my final bill as they catch up, I have called multiple times since then and only get the robot. The robot was saying I had a balance but the balance did not make sense as I had paid some of the balance and was told my unused portion of my previous bill payment would also affect that balance, so I assumed I still haven’t gotten my final bill as I haven’t received anything. I received my final bill to my email on April 7th of 305$ and some cents and immediately sent 200$ planning on sending the remaining balance on payday. The email I received has a due date of June 5th 2026 but they immediately hit my credit for 96 points for a “late payment” when I have been fighting to get a physical final bill, and I’m not gonna take the word of a robot I still am unable to get ahold of a person at Telus and I think my only option is to dispute the late payment with the credit bureau, is there anything I can do or anyone I can contact at Telus that can help me? This is a devastating hit to my credit for something I have been actively trying to pay and would have been paid by the due date of June 5th so why did Telus hit my credit today april 11th? Any advice would be appreciated, I really want to fight this it’s been a devastating hit to my credit.