Payment of TV License at PnP

A few weeks ago my wife went to Pick n Pay Claremont (Main Road) to pay our TV license and produced her ID to pay the account, only to find out a week or so later that the account has not been paid after recieving a call from the SABC.My wife went back to PnP to enquire about it but she did not have receipt so she told the lady which point of sale was used and that she produced her ID number. After the inestigation the person advised that the payment was made to our DSTV account in error, and that it could not be reversed. The person also advised that we should pay less on our dstv and just redo the payment. Over and above all of this person advised that my wife should go pay it at the Post Office the next time. What kind of service is this? We pay at PnP because its convenient for us to do so. How can Pick n pay staff advise us to go elsewhere, do they not want the business?, because along with paying the license, we also bought at least R400-R500 worth of groceries.