Iphone 6 problems

Good Day<br> <br> I have a contract with Vodacom which commenced in March 2015. I bought an Iphone 6 64GB, the phone started giving me problems in May/June. I took it for repairs in July, the phone had a temperature problem, and flashes blue light, and would switch on and off at any time. I took to to Menlyn a few week later it was returned, and they said it needed a software update. The phone started having the same problem, and I took it to Middelburg mall, and they told me they couldn't assist me and I have to take it back to a Repair centre. The phone doesn't charge and its written \Temperature- Iphone needs to cool down before you can use". I'm paying Vodacom on monthly basis"