Jet airtime contract not cancelled

Good day

I am very unhappy with you service i've been trying to cancel the airtime contract plan from October 2017 an yet still no cancellation took place and i am still being charge close to R100 every month for something i am not using and trying to cancel. In total it is R300 which is alot of money to me and i want to be refunded or else i'll write a letter with all my references to the ombudsman.

Your unhappy customer Juanita van Niekerk