[Resolved]  Homeshop18 — about my 2 months calling tablet phone

I have brought my calling tablet phone by seeing the homeshop18 program the company of the phone is i kall 4g calling tablet but i found that after inserting the sim, after 3-4day i was facing a problem that when i use the phone, after 5mins it becomes blank and it says that it is not responding and it always show this so i feel problem to use it. Not only this when i go out i never get network and sometimes it is seen that if any body is calling me i am not getting their call. Sometimes if i call any body they does not receive the call. I am have shown my tablet to all the phone repair shop in my locality, but they said that they cannot do anything,. I have also shown to many tablet stores but they said the same. When use my phone i always give 100%charge. When it says that it is not responding, when i am in home i found that there is network, full charge and wifi and all network is good then also it says that it is unfortunately stopped. So i will be happy i[censored] change my phone or give me a small 4, g android phone and look over this matter, then i would be happy so kindly plz see this. Thanku