No responsibility to their mess up!!!!!!!

I had taken my samsung s8 into vodacom to be repaired in September, when I picked it up I found there were still problems with the device and had taken it back. They had given me the previous job card which I dont know why ? Anyways I picked up my phone 2 weeks later . Fast forward to January I plugged in the device and it started smoking and the charging port melted !!! I immediately took the phone to vodacom only to be told I would have to pay R1100 rand for them to fix it ! Had they given me a new job card when I had taken it back a second time ! It would have been covered by the 3 month warranty on the repairs that they do ! Not only that but I had then taken the phone to a Samsung centre and when they looked at the device they said that moisture had gotten in due to it not being sealed properly!!!!! It is absolutely ridiculous that vodacom is not taking responsibility for their mistake !!! Everytime I want to speak to a manager they says he's not there!!!!