Extremely bad service by Supervisor

My sister went to Vodacom in strand to get information on upgrades. The supervisor (Kerwin) explained what she needed, so the next day she came back with all the documents. Then he explained they dont have stock, but they will have the next day between 12h00 and 14h00. He also mentioned he will phone her so that she could come.He never phoned.She went at 16h30 she wetn and got the phone but was told to come back to next day again to sign as the system was offline.She then went back to sign.HE was suppose to load an additional 500meg data bundle.He said he did, but actually never.Monday 11 Jan she phoned him and he said he will correct it.He never did. She phoned him again. and he said he will fix it. I phoned at 13h00 and he said it will be loaded before 17h00.I phoned at 17h12 as it still wasnt loaded.He said he would phone me back, but never did. I phoned him again on tuesday morning and asked why it still hasnt been done.He then gave me a lame excuse and said it will take 24 to 48 hours.I am very concerned that this is the supervisor giving this bad service, and to date the data still has not been loaded.Please get someone that knows their job call me to fix this.