*** sold me lies

Yanga sold me a contract for 2 of the Huawei P8 lite 2017 at R149pm. Phones were delivered then I got a statement telling me my monthly fee is R369pm I called the MTN call centre and was advised that the package loaded says R369pm. I then e-mailed Yanga on the 4th of January 2018 requesting him to call me and explain what was going on he did not bother. On the 17th of January 2018 I called mtn again and demanded to speak to a manager and the lady i was speaking to Gwen Nkosi asked me to forward her my proof of contract so she can assist. I e-mail Gwen and copied Yanga and all of a sudden Yanga responded. He then explained some package I have never taken that was supposedly R369pm but my argument remained the proof of payment and the sales phone call made to me. Nowhere can anyone at MTN justify or prove that I agreed to a contract of R369pm because this did not happen. Please can my billing be rectified and the correct contract loaded on my profile before I take this further. I am lodging a complaint with the NCC as we speak and next steps will be CPA.