vodacom

I bought a prepaid phone at vodacom it kept on freezing within four day i took it back to the shop they send it to the factory or repair then they tol me it was faulty then within few days they said it was repaired, now im no longer interested in it now they keep running away from me if icall them they say im not the one with the authority to do credit iam so frustrated because buying a phone was for business purposes not entertainment, no one really want to help me i paid cash , vodacom service is very bad i can not lie. today i went to Umhlanga branch the manager did not want to help me he told me send email to escalations which i did more that 5 times last week