bad service

i recently app**** for an upgrade and new line with vodacom,i received both cellphones on 26/11/2018 and the iphone was not working properly,i then called vodacom the following day to request them to collect the phone as it was faulty,my call was taken by Gugu who logged the request for the cellphone to be collected and told me they dont do exchanges for iphones and once phone is collected they will cancel the contract .3 days later i called to double check that the request was processed and i was told that it is logged once cellphone is collected i will need to call vodacom again to cancel.i disputed this as that was not what the agent first said.Gugu was again put on the phone and she started being very rude when i questioned her for the information she gave she continued to be very rude.i demanded to speak to a supervisor and thembinkosi was then put on the phone and he also did not seem interested in what i was calling about,he then advised they will listen to the call with agent and come back to me.to date i have not received anything from Vodacom,i have been a loyal customer for more than 10 years and i am not happy with service received and attitude from the agents.i have made so many calls to vodacom over the past weeks and i would like to get this resolved so that i can move on with my life.