Nudebt issues

In November 2019 I did an online request to cancel my Telkom line as I was leaving the country . I received a reference number and told that I would receive the final bill in 60 Days. I left SA in march 2020 and Telkom was still debiting me until I put a stop order and never heard another word . Fast forward to Feb 2024 and I am in the UK and I have received a Section 129 demand from nudebt saying I owe R4810.00 . After forwarding all the details and references I get the Section 129.