Never again take contract with mtn

I took in a cell phone contract with man which was ending in June 2019 called in to cancel and they gave me new contract which was explained to me that I can come and.cancel anytime I want all.I will.have to pay is the next and current instalment then I can cancel.so on the 11 November 2019 due to not working anymore called on to get settlement amount was given punt to pay within seven days paid in 210 on the 11/11/2019 and on 13/11/1019 99 which I was advices is the final amount and call back after 2 working days to cancel but guess what even today they don't want.to cancel contract now they come.with different story all I want to cancel this dam contract that's all .now.they say ones to pay extra 211'