NOTE 4 that shouldnt be used

I Purchased a Samsung Note 4 last year and had loved the Note range, i currently have the Note 3, S4, S5, S6 edge, Note Tab 10.1. so as you can see i am passionate about Samsung. in July of 2015 my phone started giving me issues, constantly freezing, over heating, switching off and restarting. my phone has gone in for repairs 4 times with no change. i then lodged a complaint with Samsung VOC and got a call, the guy told me that he would make arrangements to solve my problem, he then told me that it would be resolved by the 31st December 2015, again false promises. i got a call on the 4th January 2016 stating that they have tested the phone by leaving it on the whole day and it hasnt lost too much battery life, i was then told that the technician needs to make a decision as there is no fault( guess im dreaming it up). i was told that i would be called on the 5th January at 2 to give me finality, now the 6th January 2016 i have still not received any call. i am now highly frustrated as my phone has been in to your service centre for almost 6 months in total