Vodacom wants me to upgrade a number that was advertised as free

Hi signed a 24 contact August 2018 @ Makro thru Vodacom. 2 Phone 1 contact deal. 2nd number and phone was supposed to be a bargain deal(Total contract was R189 + clip = R207 )

Complaint - I want to give my one month notice on 2nd number. Guess Guess? - I am only allowed to cancel 2nd number in October 2020. Is that really 24 month contract then? It's going to cost R39 extra for 2 months unnecessary(I wouldn't have had a problem if a consultant explained this thou).

Yes I can afford the R39 * 2 months - it's just about principal of 24 month contract. And also the fact that vodacom mention 4 times this number is due for upgrade? It was supposed to be a free airtime number, not trying to hustle more money after 24 months out of me.