Bad I will never ever thing of taking a contract with mtn even again

I have taken a contract with mtn. They sent me 2 cellphone so I returned 1 because I only needed 1. This all happened in November 2022. Mtn was debting my account every month for 2 phones I went to quest the why was I being debted so much the salesperson told me that I am paying for 2 cellphone. I show her my IRMS number and she's email the warehouse for feedback right up until today I keep calling and emailing nobody can give me a answer or just cute my call.