Broken Phone

Hi I was offered a package of a Huawei P8 with a Huawei tab later I was told the tab is out of stock and no longer offered whats on the table was a AG mobile tab, I had doubt becaus phone is not popular but i agreed. I received the AG mobile tab on the 18 January 2016 hardly 5 days the phone broken (it keeps on saying insert sim, no network available and it freezes). I called the call centre I'm being transferred to the repairs department where I've been put on hold for an hour, finally when somebody unswers no one is talking on the phone but I can hear people talking at the back when I try calling again the call centre consultant says the repairs department people only work from 8-5. I'm asking myself if them answering the call in not talking was to push the knock off time....? This is unacceptable.