Showmax via Telkom, my dreaded mistake!

Subscribed to Showmax on the 8th of Feb via my Telkom subscribtion (Against my better judgement) After reading so many bad reviews of people trying to cancel and not being able to do so, I decided to attempt the cancellation. I tried contacting the mobile service number, only to get cut off, after that I downloaded their "service cancellation" form which I requested the cancellation on the 15th of Feb, heard nothing. Resent the form on the 28th of Feb again and no one responds to my emails.

Now my subscription for March shows I owe R307 (R139 is part of my monthly LTE subscribtion) Where on earth does the balance of R168 come from???? Even if I was billed for February and March the total should be R69 + R69 = R139. I can only assume that Telkom put my subscription through as R99 p/m and charged me a pro rata rate for Feb and that is why the total accumulates to R168 + R139 = R307. In the interim I have managed to get through to your call center this morning and I was advised that my subscription has now been cancelled, although when requesting a ref# I was told by the agent she can give me her name which is "Nontobeko Ngubane" Please tell me, how do you as a company tell clients that the agent's name will suffice as a ref#. So when I phone back to follow up and I give Nontobeko Ngubane as a ref# who is going to be able to track the request???

Telkom, please could you explain to me how you calculated this and also do you expect me to pay for the subscription which I cancelled?