Poor Customer Service

Earlier this year I did an upgrade and I was informed by the consultant that helped me if I ever wanted to cancel the sim only contract I needed to give MTN 1 months notice. Last week I called 135 and wanted to cancel the contract and the consultant who was assisting me advised me that its a 24 month contract. I raised the fact that I was told otherwise and requested a copy of the call which I was told I need to get it via sales. I logged a call via customer services and I was told I need to get a copy from retentions. This has been such a frustrating experience for me that even if I would reconsider staying with MTN I would rather cancel.