Phone freezes

I received a respond from Vodacom on the 15 th of this month informing me that a consultant will contact me. After not hearing a thing I been phoning with no luck and the freezing problem on the phone its escalating. I'm really struggling with it aalmost every time I pickit up it has to be restarted not so it restart while in use. I contact Vodacom for the last 3 days of last week with empty promises that someone will get back to me