Bad cellphones at foschini beware

Recently my husband purchased me a mobile phone hisense from gateway foschini within a week it already started giving me problems. It heats up when in use n especially on a call. I took it back to the store they sent it to there technician at 3G mobile. It was sent back n said that nothing's wrong with the phone. After running endlessly to the store I was asked to take the phone back as there is nothing they can do. Staff was not helpful at all . I am so dissatisfied with there service. The phone is still giving me a problem and I have already spent a month without a phone while they have messed up. It's as if they are paying me for the phone. I called customer service and still no help on there side. I'm even scared of using the phone what if it blows up while I'm on a call. This is ****************