Cancellation discrepancies!

I am honestly just blown away at Vox. I put in my cancellation on the 6th of June 2023. I was called by an agent who had advised me that I needed to pay the end of June invoice to finalise my cancellation. I had made payment at the end of June as agreed. Sent the proof of payment through to Vox and waited for them to collect their devices. Now in October, Almost three months later I am informed that my account is in arrears. No more invoices were received as usual monthly so I assumed this matter was resolved. Vox absolutely refuse to cancel the service as of End June because I was 6 days short of a calendar month. Services on that fibre line was actually not used as of the 31st of May 2023. I was wanting to re-instate a new Fibre line but now I am hesitant. ***. I offered to pay a pro-rata for the days I was short in June on my cancellation (6 days) but it was refused and they want a full months payment for July or they will hand me over AFTER a consultant had confirmed my account was closed! Id like telephone records pulled. Very difficult process.