Being charged for something I don't use

I app**** for a Contract via MTN Direct in November 2017, eventually received the phone just to see that they send me the wrong one, told the guy who did the delivery it was the wrong phone, he tells me he can't take it back.

Fine I called MTN Direct, the agent tells me to take the phone to my Local MTN store she will arrange to have it picked up. This agent now don't even work for MTN anymore, via email the supervisor informed me of this and assigned a new agent, who tried to help me but after 2 weeks no response from the agent.

In the mean time I'm being billed for a phone I don't want, airtime and data i don't use. Now going on 4 months I'm paying for something I don't have. Call MTN Direct nobody seems to be able to help me - the agent I called on Friday 13th April 2018, told me that I should have taken the phone to an MTN owned store - which nobody told me.

So I drove 200KM to my nearest MTN Owned Store so they can return the phone, just to be told they also can't help me - they only took in phones that been received in the last 14 days. Really?

So now I asked is this the service MTN gives - Charging me monthly for something I don't have - they can't even help me, MTN can't help me - So now I must return the phone myself, really where to? I just don't want to pay for something I don't have, this was MTN Direct's fault, why must I pay?