Royalty Rewards

I have been getting texts from Royalty Rewards and they tell me that on the 25th of a particular month my account will be debited by different amounts. First it was R95, which I blocked. They changed the debit amount to R98. I have never spoken to anyone from the said company. When one calls their phone number, no one picks up. Eventually I managed to get through to the support line and the agent kept me on hold for more than 5 minutes, after I told him the reason for the call