No service or willing to resolve problem

Neotel and Nudebt are trying to **** me out of money when I had cancelled my 2 accounts on the same call to Neotel on 15 March 2019 after receiving notification from Neotel that they would be discontinuing services. They cancelled one account but not the other. I had advised Neotel of this. I used another service provider in May and sent them my invoice from that service provider. I no longer have the reference number for the original call as I have changed phones.