Making customers pay for THEIR mistakes!!!!!

After having had to resort to hellopeter.com less than a month ago to get issues sorted regarding my billing that had been done wrong for the past 3 months, Rain contacted me and sorted it out the same day. But what do I see today???? I WAS ACTUALLY CHARGED FOR RHEIR MISTAKE!!!!! They charged me almost R500 to fix THEIR mistake!!! This is preposterous!!!!! I WANT MY MONEY BACK!!!!!