Appalling service in Greenstone

I had such an appalling experience at Vodacom Greenstone Mall. I went to Greenstone because I woke up to my SIM card not working and the number was given to someone else. I went to the store to query and was med by rude and impatient customer service agents. One was chewing gum the other after I expressed frustration said Vodacom doesn’t need me and she doesn’t have to assist. I want to send a complaint to the branch and get feedback that it’s been followed through.