customer care incompetant

I'm trying to reconnect my cellphone line, I understand, I did not pay on the due date but I have made a payment on 13/08/2015 with cash deposit. I then phoned them and told them that I did make the payment, I then asked them if they can reconnet my line, they said they can't see anything on their system. I am then transfered to the manager who also said that he cant help me \very arrogant"... I then asked to speak to someone who can help me"