Terrible service, and unkept promises.

The battery on my iPhone 6s was replaced on 10/10/2018, but this 'new' battery did not last more than a day. I made another booking to take it back on 21/11/2018, as apparently I had a 90-day warranty. I took a day off, went through to Sandton City (from Centurion as the iStore in Centurion is currently not taking repairs due to renovations), and booked in the phone at 9h00 in the morning. The lady that booked in the phone promised me that she will do her best to fast track this, as this is the second time this phone is coming in for the same issue. And I explained to her that I will have to hang around in the mall until the phone is done. She PROMISED that the phone will be back no later than between 13h00 and 14h00 but she will do her best to get this back a.s.a.p. 12h00 - they have not even started with my phone. 13h00 - still nothing. 14h00 - still nothing. 14h30, I simply could not wait any longer and asked her just to get my phone back. I had meetings setup for the afternoon, and could not wait any longer. She promised that the phone will be back within 10 minutes. 15h30, an hour later, I received my phone back. Un-repaired. I have wasted an entire day, petrol, toll fees, etc. and my phone is still not repaired.