Unacceptable Customer Service

The disappointment in Vox is beyond comprehension. I cancelled my line with them in 2022 and the cancellation went off well. Since I only had the installation for a few months I was liable for the cancellation fees, router and UPS. Vox collected the router and UPS from me. I was later informed I did not send back the UPS and that cost was added to my cancellation fees. VOX accounts department provided me with an amount owed. I made a payment arrangement with Vox and adhered to the monthly payments from Jan-Dec 2023. Come Dec 2023 I reach out to Vox via email, the same person who provided me with the amount owed. I email them, attach proof of all bank Proof of Payments and request that the account be updated as it is paid up. I now receive comms from Vox that I must contact Vericred as my account was handed over to them and I will have to pay them the collection fees. How can I pay Vericred collection fees when I have had no dealing with them, when I have had no arrangement with them. Where do Vericred come into all of this? Now I am told the account was handed over to Vericred but that was not communicated to me and the arrangement I had with Vox accounts department, every month the payment was received. So I am struggling to understand how I got handed over and not told about it. How I got handed over when Vox was receiving the amount we agreed upon every month. Now I owe Vericred, why do I owe Vericred when I paid the amount I owed Vox. This is absolutely ridiculous and unacceptable. Vox I need your accounts department to fix this.