Incorrect billing - No Help from customer care Agents!!!

<p>I took out a cellphone contract and I called the customer service and also chatted to agents online via the Telkom website , which I requested to put a cap on my spend limit as I did not want to pay anything more than my subscription fees (R199). To my knowledge it was done as the agent advised me so. Now I receive my invoice and I'm been charged a hefty amount(R699) which is nonsense . I called the customer care line for assistance and the agent required me to screenshot and send the reference SMS to him which I no longer have. All calls are recorded for a reason so why can't they go back and listen to the call recording to resolve my query. These agent's are *********** and I am not willing to pay anything extra. I am extremely ****ed with the service I am receiving from Telkom. According to my Telkom App which I downloaded from Play Store it also indicates that it has a spend limit of R500 set , yet on two occasions I asked the agents to have my spend limit changed to R0,00 . It also indicates that 0,00 spend limit must be effective from 3rd Feb 2017. It's now April so why am I been billed extra ?? The only proof I have is the screenshots of this ref number which I got from the Telkom App. ? is unfair on me . I really need this resolved ASAP</p>