TFG adding some magazine subscription to my invoice to make my monthly interest high without my knowledge.

Tfg add Jet club subscription ( magagines etc)without my knowledge, they have call trying to convince me to activate jet club and i have been telling them i want it , so to my surprise i see that they sent me a massage stating that my monthly payment has changed from R 155,00 to R 168,00 on to find out they add some subscription to my account which i told them am not interested into. So please help me to remove that subscription from my account.