Was given as bad service and phone not repaired

I went to CNA Key west beginning of November to take my phone in for battery problems.The phone was booked in & was told that it will be ready after 14 working days,I went on the 16th day to check if my phone was back, only to get there & be told that it will come after 30days. Asked for the cell phone specialist to call me as I was told that I cannot be assisted by any other person. Shadrack which I believe is a cell phone specialist did & told me that the turn around time was 21days & that I should not tell him how to do his job & it's not his fault that his colleagues don't know anything about cell phones as they all work in different departments, all of that was said with a very loud tone. I got a call on the 7th or 8th of dec to go collect my phone, only to get there & nothing was done on my phone, as nothing was written on the job card, asked the cell phone specialist to assist with checking data on my phone & to my surprise nobody in the store knew how I then was told to go queue again as I needed to buy airtime so that they can assist me with internet. made them aware while in store that the battery is still not ok but was to go charge it & come back if its not ok.