Vodacom Contract

I am very disappointed with the service given at Vodacom. I took a contract with Vodacom on the 11/08/2022 which I initially agreed to pay R189.99 monthly instalments. in December when I received my statement the instalment amount increased without my acknowledgement to R276.99. I called several times inquiring about the sudden change in instalment, I have been speaking to various consultants which none could given me a valid explanation. I then requested a settlement amount so I could cancel the contract, which was not given. I decided not too pay up until I received the settlement amount, reason being I did not signed up to pay the increased instalment. After a few months I received the settlement amount, which was fully paid. I called to inform and cancel the contract, which till date I am awaiting for the cancellation to be processed. please could kindly assist with this urgent matter.