Bad service

I took my phone to mtn tzaneen to get it disabled because my little sister disabled it.. The man told me I could come pick it up 4 o'clock so I was there 4:10 and he told me to come back the next day same time because my phone wasn't ready so the next day I went and again he told me to come back Monday... I told him that I needed my phone because I was in a hurry I have to leave for Johannesburg on a business meeting for 3 weeks... I asked him the first day when my phone will be ready and he told me in a few hours.. The next day he forgot my phone at his house( I don't think staff is supposed to take other people's properties home ) so the next day I were there 4 o'clock and he told me so come back Monday after I told him I'm leaving Saturday for Johannesburg for 3 weeks I don't have time to drive back to Tzaneen... I think if you tell someone it will be right that time that day it will be right and stop telling me the next day the next day...