Repairs

my dad has a SONY Experia Z5 and it has been in and out of Vodacom repair shop since July 2017. Between now and July he has had to take it in for repairs 4 times already for the same problem of overheating, he has just been told that they will only replace the phone if he brings it back for the 5th time with the same problem. As far as I am concerned that is just non-sense. It is just service that is pathetic and just shows that Vodacom takes people for granted. SON Y agreed a long time ago that should the phone continue to give him problems, then Vodacom must replace it. My dad is self employed and each time he has to take his phone in for "repairs" his business gets affected. This is just being inconsiderate.