Poor Customer service

Phone booked in at Samsung repair centre on the 05/09/2015 . 6days later received a quote to replace the battery. Than I email the lady to say that I don't think there is a problem with the battery as Vodacom replaced the battery when it was still on contract and we had the same problem after a brand new battery was given to me. So she still insisted via email that if we change the battery, will solve the problem. I asked what guarantee can she give that this will solve the problem and if it is not solved by replacing the battery what do we do and she didn't respond to me for the next few days. Back and fort with emails for a week and not once did she try to contact me to understand my point of view. After not getting any response 3 days later I send a follow up email. She still insists the battery needs to be changed and didn't give me an answer to my question. Than I email her so she didn't respond for the next 5 days. Thereafter I asked to be put in contact with her manager to speed the process. So she escalated to Evans on the 23/09/ 2015. On the 14 October I follow up with Refilwe stating that Evans has not contacted me,she replies saying he is unavailable. It's now 8 weeks