False information on Black Friday deals MOBILESPLUS

I currently have a data plan with MTN which is due for an upgrade. A representative contacted me from Mobiles plus offering me black Friday deal from mtn. She stated i would receive 80 gigs anytime data plus additional data for streaming, YouTube etc. for a monthly fee of R149.00 over 24 months. i signed up. Later that evening i checked the mtn black Friday deals and found out that this deal was incorrect as stated by the representative from mobilesplus. in fact it was 10 gigs day and 10 gigs night- total data for this package was 80 gigs. I immediately emailed support at mobilesplus requesting that this upgrade be cancelled. No one contacted by but the next ,morning i telephoned mobilesplus. I spoke to a lady by the name of Priniece. She stated that since order was still pending she would cancel it. that evening I received a message from MTN stating that the upgrade had been approved. once again on weds evening i emailed support at mobilesplus requesting a cancellation of the upgrade. i also contacted their offices on thursday morning- spoke to the same lady- she promised that she would give this matter her urgent attention and resubmit the cancellation urgently. the time is now 22h05 Thursday the 25 November 2021- After several phone attempts I still have not been contacted by any manager, supervisor or representative giving me any proof that this upgrade has been cancelled. totally disappointed with their service. I am considering whether I can hold them to wrong product advertising of 80 gigs anytime data plus addition data for R149.00 per month for 24 months