MTN failed to fix a newly signed phone in 3 months

I signed a contract with MTN shop at Nicolway in April 2015, for an IPhone6 with monthly cost R500 for 2 years, The phone was found with very low volume problem 1 week after, but I was outside South Africa by the moment, so I couldn't bring it to MTN shop for change by the time. I asked my colleague to return the phone to MTN shop 2 weeks after, the staff there made a test, the problem of low volume was true, and she sent it to MTN repair centre.<br> <br> I've been waiting for 3 months and it's still pending because of MTN strike, obviously it is MTN problem, not me, and I've been to MTN shop for many times to ask for a solution but failed. I was once told by MTN staff that I could go to MTN repair centre to fetch the phone myself in a specific time period, but only found they didn't work.<br> <br> Yesterday, I got info from MTN staff that the phone couldn't be fixed becaused of some application issue, and they will go and fetch it back this Friday, without any progress. <br> <br> It's very very upset to wait for 3 month for MTN to fix a new iphone and there seems to be no any progress or date when the phone can be fixed. I am still being charged every month, and there is no solution but just wait