unjustified enrichment n its unaccetable

Long story short I bought airtime wen I was at home in the Eastern Cape. Two days later when I got back to Pretoria I realized that the last digit has faded. I then called the call centre to inform them of my dilemma. The lady I spoke said to said I must give her my serial number and she said yes the voucher has not been used but I need to take it to a cell c store. A couple of months later I did take it to Sandton city. The guys who were helping me there did not understand why the call centre sent me to them. They took the voucher and faxed it to someone and I was promised that I will get my airtime within 48hours. on the slip they wrote a reference number and the name of the guy who was helping me.<br> A month went passed and I still don't have my airtime. I then again called the call centre and told them, the call centre lady with a bad attitude said I must take it back were I bought it!! I asked to speak to the manager who also had a bad attitude said I must take it back to the shop I bought it because the is nothing they can do. I told her I was in the Eastern Cape and I don't have the slip and am not planning to go back anytime soon. I think her name was Nondumiso . BAD SERVICE