am i being made an idiot by your consultants

Today at exactly 11:48 I was making a payment towards my account .... I was accompanied by my sister who gave the consultant R600 for a R450 bill....which in turn got R150 change...all was well untill I reached home to find my sub cancelled for missing payments....i called the multichoice call centre n spoke to a lady called Nhlamhla..she informed me that the funds were reversed .... How can this be possible if I have a receipt with me that says R450 was paid...Couldnt the lady notice that the funds are reversed before giving me my receipt?....now I'm inconvenienced because I'm sitting at home with my kids with nothing to watch just because of an *********** consultant...... I need this sorted out as soon as possible because the attitude in this place is no joke ....the Cashiers name is Mavis Swarts......

Thank you