paying an arm and a leg for a product that doesnt

I have a S6 which is approximately 6 months old. The last 4 months I have had endless problems with my phone freezing , rebooting itself and the battery gets boiling hot. I received my phone from repairs on 3/2/16. JOB NUMBER ***. I took off work to book the phone in . The past week it has been doing the exact thing. On the job card it is stated that parts GH82 - 10033A and GH96 - 08587B were replaced (NO ONE COULD TELL ME WHAT THESE PARTS ARE ) . Now I would like to no, am I going to have to be without a phone again in order for it to be replaced? Vodacom do not offer loan phones. I am a single mother and need to been in contact with my kids . Not having a phone is not an option . I pay good money monthly to make sure I have a good working phone. I need to no what will be done. Will the parts be replaced again ? Because I have another year and a half left on my contract. Is this the type of drama that awaits me???<br> Personally I want this phone swopped out as its a manufacturer problem and its going to persist