mislead by consultant

good day did an online request, i received and Wifi (HUWA wei E5573 LTE Mifi) on the 19 June 2018, Went to store on the 22/06/2018 to activate the Wifi, only find out i was wrongly advice about the product, did an cancellation on the same day at the store - case number ********** 2, was not informed correctly by the sale agent whom sold me the product, he called after a month to apologies for misleading me told me that the product will be picked up by (Courier It). the product was picked up on the 31/07/2018 by Courier It and the item left me it was sealed. I have a waybill number ********** 1. Have made several call after that and sent about emails too many people, i also have all copies of the emails sent to them. i have also done two online cancellation and to date the case has not been sorted out. i have all case numbers as follows ********** 1, ********** 7, ********** , ********** 9, ********** 7, ********** 6, ********** 6 and ********** 1. i call almost everyday day and i am so fed up. I have received a letter( NuDebt) that my account is handed over for the amount R2119.62, i have not used the product i do not have a computer or an laptop, and on the 01 st February 2019 received a bill for this amount outstanding R4,035.87, Every time i make a call will call back in 24 to 48 hours which never happens. it is 7 Months today and i am so frustrated, please can you help me to sort this problem out. will greatly appreciated it.my cell number is ( ********** 788) land line at work is ********** 166