Samsung S7 cant make or receive calls

<p>I recently bought a brand new samsung s7 on a mtn contract. I have never been so frustrated with a cellphone.</p> <p> </p> <p>The phone losers network a few times a day. All my received calls automatically goes to voicemail. (I am based in Sandton, so there is definitely good cellphone signal).</p> <p> </p> <p>The only way to correct the problem is to restart the phone. I have sent the phone back to Samsung for repairs (through MTN). I was told that Samsung did change something on my phone, and that it should be fixed up. . . But the issue has continued.</p> <p> </p> <p>I have to restart the phone at least 3 times everyday.</p> <p> </p> <p>I am tired of going again an again to fix up this phone. Definitely not something you would expect from a leading cellphone company's flagship phone. . . maybe thats why Apple overtook Samsung in sales in quarter 4 of 2016.</p>