Connection problem

I have been struggling to get network on my Samsung Note 4 since January 2015, whenever I got to Telkom Mobile I get issued with a new sim card. The sim would work for one week and then back to the same problem of not getting connectivity. Around mid April 2015 I called Telkom Mobile and was issued with a ref no.:***2, which I was told would get feedback within 72 hours but, I didn't get any feedback for 3 weeks. I then called on the 8th May 2015 and was told my case is still being investigated. <br> My sim has been replaced 3 times and the connection does not last more than 2 weeks.