Utterly disgusting service from MTN

Last year I ordered a contract phone from Mtn and received the cellphone in September 2020. But the first week of using the cellphone it was faulty so I sent off the phone for repairs and I waited 4 months for Mtn just to get back to me and tell me in December that they are unable to fix the phone and I can inturn do an early upgrade and they will waive the extra fees (since I paid for a contract for 4 months I did not use). So I headed to MTN and and did an early upgrade and the agreed upon the installment per month was R499.00 (That was inclusive of the insurance- I have correspondence with the agent) as per the consultant. Hence, I signed the agreement. I have sent off these upgrade fees to Mtn (Jason- Mondo team) in December already and in early January and I didn't get no response from Mtn. So called Mtn in January they said they will fix the bill and the I got Febs bill and it was not fixed at all. No fees were wavered and my bill was still incorrect and now I am in March and still the bill was not fixed.

I am honestly not impressed by this, what I agreed upon and what I have to pay does not make any sense and I will not pay this installment until this is rectified. Last year I had to pay for a contract I did not use and had to call every single day just to be told that they will get back to me and never did and now the fees I agreed upon and what I was charged is not the same. I am a customer and the fault was the device MTN sold me, but I had to ensure the issue got resolved I mean that's utter nonsense and now this? After being told my fees would be waived and the fact that what I signed for and what I got is not the same???- this is unacceptable.