Lack of Service & Technicians

I took my iPhone to AppleBerry in Pietermaritzburg on Wednesday , as my battery on my iPhone wasnt lasting more than a couple hours before needing to be recharged. After paying R350 to have the battery replaced, I took the phone home and then the problems started. When i tried to charge the phone, the phone would reboot itself and the battery would constantly show a different figure, jumping from 18% to 98% then down to 45% and back 65% after each reboot. The next morning I took it back in and explained to them what the problem was. 6 days later and I still do not have my phone, and have been told every day when i phone that they do not have a technician available to fix the phone. There are 3 branches in PMB and none of the branches have technicians and no one can give me an answer as to when I will get my phone back, or when they will have a technician avaialble. This is shocking service and they don't care about the customers.