60 days, no phone, still paying for MTN's **** up!

I wrote about 3 weeks backs in connection with my phone which I sent back to Mtn for repairs. My phone was given to someone else and he used it for a period close to a month and then they instructed him to bring the phone back. They gave me the phone but when I discovered it was used by someone I refused to take it back. I requested for a new phone , but up to now I have not been given a new phone. Today the 29th of May is the 60th day that i have no phone, but still paying for this disservice. No solution was given I escalated my complaint to the management but they have not given me a solution they keep on saying they have escalated my case to the relevant department they will call me but I have not received any feed back. If i do not call them, they do not even bother. Yesterday i called a certain Arno Heygenreich was supposed to call me and he didn't, when i tried his phone he ignored my calls. I have paid the 3rd debit order to Mtn (without my phone) this month for the phone that I do not have and to the company that I am receiving the poorest of services, which is very much unprofessional. MTN are you ignoring me because i am polite and act like a human being when i interact with you? DO YOU PREFER TO WORK WITH CLIENTS WHO SWEAR AND SHOUT AT YOU?