Poor Service

I received my bill for this month and there was a charge of R505 that I didn't know what was it for, I phoned telkom on the 7th of June and the lady I spoke to advised that on the 17th of May I had requested a top up but before I could confirm which type of Data I wanted and what price I got cut of on the chat but the agent took it upon herself to load all network data instead of the promotional data of R 149 which I always top up with. I was promised a Manager will call on the 8th of June to reverse this amount of R 505 on my bill but still today no call was received from telkom, i've been phoning the whole day today to no avail and every time I go through the chats after explaining my story to 4 different people on the chat I get disconnected every time, eventually when I got through to Zanele she is now saying a different story that I agreed to the data for R505, i've asked her to send me the chat where I authorized that she tells me they are not allowed to share that information, I refuse to pay for something I didn't authorize... I still have gotten any assistance or resolution regarding this matter and very disappointed and frustrated with the lack of service I have been getting from Telkom just because a person doesn't want to admit that they were at fault.