New faulty phone

Contract upgraded on Tuesday 14 July 2015, on 15 July the phone was having a problem of freezing, overheating and eating the battery i took it back to the vodashop they said i must take to Witbank to their technician and i did so but at Witbank they told me that the manager is supposed to give me a new phone because this phone its new and it was fault before 7 days i then went back with the feedback from Witbank. Kim send the phone back to Witbank and it came back they told me that the phone doesn't have a fault, then Billy Coulson(manager) said i must leave the phone with him for monitoring it till tomorrow and i did. when i come back he confirmed to me that the phone is faulty and he will write an e-mail to their head office. On the 5 August i went to check but he was not on duty and left the message to the white lady with a bad attitude that they must tell me that the phone was having a running download at the back and theres nothing he can do with that. I have to take the phone that is still giving me the same problem and frustrating me on daily bases, yesterday 13 August i went back to tel him about the continuous problem i have but he was having bad attitude towards me.