No response after almost 2 months

My previous complaint was posted here almost 2 months ago and I still haven't gotten any response as to what's happening with my phone. My previous post went as follows "Around 2 months ago I decided on getting my father a new phone because his was faulty and affecting his business,so I had a upgrade from MTN due so i decided to use it to get him a phone. After looking at the phones avalible I settled on a CAT S30. So I went ahead,did the paperwork and got the phone. We had the phone for not even two weeks,the phone started rebooting itself and losing contacts it had on it,so we took it in. 2 weeks later after countless phone calls to MTN Cosmos at the glen we eventually got told that the phone has been replaced and we can come collect a new handset. My father used the phone for a while and this new one started doing the same thing. So the process started again,sending it in,countless phone calls until we were told we can come and get another new phone. We fetched it and just like the previous 2 phones,the EXACT same thing started happening to it too. So we got in touch with somebody at headoffice and after explaining the whole situation to them,we were informed that we can get them to exchange the phone for a different phone due to the fact that CAT clearly makes a poor quality phone. We once again sent the phone in to the store to have it assessed. We got a call today from the manager at MTN cosmos at the glen informing us that mtn wont be doing anything with the phone and will be returning the same phone back to us because they can not find anything wrong with it and that there is a mark on the phone. So now basically MTN is telling me that we basically have got no choice but to use a faulty phone (which,from what we have seen,is definitely flawed phone) for the next 2 years. All of the new phones we have been getting hasnt even allowed me to sign off the insurence on it.

This is becoming more and more of a problem and an even bigger inconviniece,due to the fact that it is a business phone and not having a decent quality phone is leading to my father not being able to make or recieve business calls.

Something really has to be done about this. After 5 years of business with MTN I have become used to bad service,but this has honestly taken it to another level."

All I ever received was what I assume is just a pre written response saying that my case has been escalated with a reference number (which I must include doesn't work). I'm tired of dealing with this stress that MTN is causing me. I'm literally still paying for a phone I don't have in my possession and this has started effecting my fathers business due to not being able to take calls. This is my last attempt to get MTN to assist me and sort out this problem before I go further with this and get the cpa involved in this.