Unauthorized charges on account - Bad service

I opened a Makro account in March which is done through RCS. After opening the account i got a call from Makro offering me a R500 voucher for cellphone accessories "for opening a new account". A few weeks passed and I received the voucher via sms, however i never used it. Since April I've been charged R299 for Blue label subscription four times on this account. I've sent numerous emails to both Blue label and Makro requesting cancellation and refund but nothing has happed to date. I asked Makro who gave blue label permission to put charges through on this account and they could not give me an answer. I want the charges reversed.