MTN charges and Pro- rata fees on contracts I don't ask for

It took me at least 5 attempts to get a router contract in June last year then eventually they upgraded an account I had which I didnt consent to in order to conclude my new third contract. A few weeks later I get a call selling me an upgrade on this third contract. I specifically asked why call me when I just took out a contract they said no it's an upgrade not a new contract. So instead of 40g for 250, I would pay 200 for 50g. Which in my call I said is a no brainer. He stated he will send me a sim I confirmed why would you send me a sim when I have one. He said it's a formality. I am now paying for an additional contract I didn't ask for and I have been trying to speak to a manager since November but it seems MTN don't care to fix it. Out of principle I want the contract they offered at a better deal and I don't want to pay a cancellation on the contract I don't want. And I find out today that I paid a pro-rata on an upgrade that was done in January which once again I didn't ask for . I was transferred just today alone between 3 people and everytime I am told I have to speak to different departments. I pay 1 company, I don't see why the different divisions selling me different contracts become my problem. I have been with MTN far too long and every year their service gets worse