Angry As Hell

I have taken time to look at my online statement today I did not go far back but I see on the 23 I was billed R20 for a phone call I never received a call from you guys the only thing I receive is an sms says I should pay before I made a payment on 24 I am the one that called you guys but still I wS billed another R20 no guys no I called you not the other way around.