Mtn Day light robery

I have a data contract with mtn which is for router and data, around December 2021 they called me offering me unlimited data on the same contract, I accepted because my understanding was they are going to supply me with the new router and Sim card for unlimited data but I was to pay the same amount, the old router was to be disconnected as they are upgrading me to the new one, first contract was for 36mnts but they called me way before the term end, the proposed router was only delivered in January that time the old router was still active, month end they debited 3x agreed amount when I called to follow up on what's happening,they advised they will call me back within 3 working days, I didn't receive a call or communication from them I called today and they told me I have agreed to everything I have agreed on having two routes and that if I want to listen to the recording I can take a day off and go to the nearest mtn store to listen to the recording, my problem is I feel like there was misrepresentation here if they say I agreed to those terms did the agent that called me whilst I was at work made sure that I understood what she was saying or was she just pushing sales, why would I take offer for second router, I feel like mtn doesn't care about its customers as they said for me to cancel router I have to go to the nearest store to confirm cancelation amount, I don't have those extra fees I need this resolved or better still cancel all your services if you can't help me