Billed for calls

I previously instructed Telkom to remove my spend limit, however recently i received a bill with call charges. I then reported it to Telkom but with no help. I have spoken to Zanele last week and asked her to check all the calls i have made to them and send me copies. She called me yesterday telling me there is nothing she can do i made those calls therefore i should pay for them. I have instructed her to send me all the recordings of the calls i have made to them. I want those recordings to prove my instructions to them but it seems they don't want to provide me with this recordings. Hopefully someone will look into this and help.