Telkom refuses to cancel my prime video subscription

Last year I took a fibre deal with telkom of R389, I was told it comes with a deal with prime video that’s for free for the duration on 3 months. I was not using prime video so I decided to cancel that subscription but keep the fibre deal. Telkom has been giving me a hard time ever since. When I call their customer service they make me hold the line for long with no assistance, I have visited 3 stores that refuse to help me cancel. They say I should call prime video. I have asked for the prime numbers which they say they do not have. When I google online it says I should contact the third party (which is Telkom) to cancel my subscription. I lost my job and I can’t afford to pay for a subscription that I don’t use. I am now paying R488, I’m so frustrated and disappointed in Telkom for making me run around instead of just cancelling the prime video subscription. I hope I can get help. Thank you.