Incompetence when it comes to phone repairs

I took my Sony phone on the 02/05/2018 that was purchased a month before to be fixed as it had a problem with using mobile data and saving photos from external applications like Facebook and Wassap e.g. My phone was taken in and few days later I received an SMS confirming the phone was fixed.

I went to the store to collect my phone and I was given the wrong device.I informed the Repairs Manager Vincent that the phone wasn't my mobile he promised to have the problem fixed. He checked and found my phone I asked him since there was a mix up is he sure the phone was fixed he said it was fixed. When I had to insert the sim card to see if all was now well we found out that the Sim tray wasn't there and I couldn't take my phone with. He said according to the information on his system it said the phone was brought with a Sim tray. The manager then advised that he will request the driver to drop off the Sim tray which never happened. I went back to inquire about the Sim tray the Repairs Manager said he never received it he will send the mobile back at the warehouse were the repairs are done. Few days after that I went back and he said the Sim tray that came with the phone was the wrong one so he informed the person who is the manager at the warehouse by the name of Matthew to sort out the matter. Waited again and never got any positive response. I asked Vincent to show me the proof that indeed he was speaking to the Matthew guy.He printed out the email's and I requested to directly speak to him that was between 21st or 22nd of May. Matthew advised me that the Sim tray had been ordered and I would receive it latest by the 25th of May .The 25th came and I still had no positive outcome. Vincent offered me a Samsung loan phone to use until Monday the 28th as he said Matthew told him that the Sim tray is coming from abroad and they had not received it yet.The phone wasn't charged so I got home and tried to download my Applications but I failed as it wouldn't use my Gmail account.Vincent assured me that I would get it by Monday from one of his colleagues. I went back on the 28th and it still wasn't there. I was assisted by Vodacom Repairs sales manager Tammy who said that I should give her time until the following day to sort it out as she wasn't aware of the problem. Tuesday I went back and she kept her promise the Sim tray was received as per agreement however the phone wasn't still fully fixed.She said since it took a while for me to get the Sim tray we couldn't have been aware of that problem. She offered me a better loan phone and had all the applications I require downloaded for me free of charge and made me speak to another guy by the name of Andrew who has promised that my phone will be ready by Friday the 01st of June.I also spoke to Matthew asking what happened to him keeping his word and he said they had a back log in receiving the Sim tray and he knows nothing about it coming from abroad. Tammy who is the sales manager from Vodacom Repairs is a hands on lady and they should hire more people like her.Vincent is a story for another day as he had also once promised to give me a call to keep me updated and he never did that when I went there the excuse I got was he deals with a lot of customers and they are short staffed