UPSET CUSTOMER

I BOUGHT AIRTIME YESTERDAY WITH R3 ADVANCE FOR 60MIN VOICE AND I RECEIVED MESSAGE THAT THE 60MIN WAS LOADED. WHEN I WANT TO PHONE THEY SAID I MUST BUY A R10 ADVANCE WHICH I DID FOR UNLIMITED CALLS AND AGAIN RECEIVED MESSAGE THAT IT WAS DONE. BUT STILL I COULD NOT PHONE ANYBODY AS THEY KEEP ON SAYING I MUST TAKE R10 ADVANCE. HOW MANY ADVANCES DO THEY WANT ME TO TAKE. SO R13 ADVANCE DOR NOTHING. I REFUSED TO PAY BACK THE R13 EVEN IF IT COST THAT I DON'T LOAD ANY AIRTIME IN MY PHONE AS THEY WILL JUST TAKE THE R13+ OFF MY AIRTIME WHICH THEY DID NOT SUPPLY. I'M A VERY UPSET AND ANGRY CUSTOMER.