Over the limit

I have a contract deal with telkom which I took last year, everything was fine until this year when I found out that the contract I was given had no limit over the calls I made which I clearly stated over the phone when I did the contract deal that I want my calls to cut whenever I reach my limit unfortunately I made calls and it didn't cut so now I have to pay a fee of about r700 and to be honest I don't have that cash which now has amounted to r1500. When I called telkom to ask for the voice recording the say they can't give me without a subpoena and that I should get a court order and I can't even afford a lawyer