Misled on a tariff plan

I have been a cellc customer for more then 13 years I have referred friends and family to purchase various products. I am currently an online English teacher and because I am a long standing cell c customer I decided to purchase their 1 TB deal for R899. I purchased this on 17 October 2021 before purchasing this I had researched the price as well as what I would be receiving and for how long when I got to the store on the 17th before making the purchase I had spoken to the sales person who assured me that the deal was 1 TB for 60 days at R899 as listed on their catologue there were also promotion boards at the store with this deal before making a payment on this I once again enquired that this would last me for 2 months and again I was assured. After using the the Sim card for teaching from then on 17 November 2021 30 minutes before a lesson I wasn't able to connect to internet after calling cell c I was then told that the promotion on the 1TB for 60 days had ended and there was nothing that could be done I then requested a manager who also saw that no notifications where sent to me advising of the experation date or of the tariff change he advised he would have this escalated as I pleaded on this being sorted as this is my job and only form of income he advised I would be contacted on 18 November 2021 by 4pm which never happened ended up missing 3 lessons and NOW face penalties for this. I then contacted cell c again twice the customer service agent dropped the call on me after calling again I asked for a manager after re telling my story and providing the Ref number which cell c had smsd to me the manager karabo advised she can only see that I made contact with the manager senzo and that she could not see my case which I don't understand because I received a text with this Ref number she then said she is u certain why I was told I would be called on the 18th because the time frames are 48hrs again I put through my concern about my job which I could potentially loose only because I was misled she then said she will get senzo to call me I asked for a time frame was given none.It is now the 19 November and I have still not been contacted in any way to have this cleared up I would also like to. Mention that when my data expired I did advise all consultants my last balance as at the 16th was over 800 GB. I am absolutely disgusted at the lack of interest from cell c for their customer and for not even having the decency to assist me because I am in a huge crisis regarding whether I will have a job or not all because cell has ****** me and misled me just to receive a sale!!!