fals advertising on easter sales

On the 4 of April I upgraded to the Sony experia Z3 which includes a powerbank, skullcandy headphones or selfie stick plus you get the sony smartband talk SWR50. After the contract was completed we asked for a printout of the contract. At night i decided to go through the contract just to make sure it is correct. But on the contract i saw that the sony smartband talk SWR30 is on it. The next day i went back to the vodacom shop and said that there is a problem with the contract and showed them their easter deal. The woman said that it is not registered on their system. She send an email to the head office and said she will let us know about the deal. The next day i went back to them and they said that it was a printing problem and that i can't get the SWR50. The easter specials was on from the 25 of MARCH until the 30 of April. Please help me with this false advertising problem as i expect a smartband talk SWR50 as advertised .