Disgustingly bad and dishonest service

Have taken my phone back to Mtn to be repaired (for the same problem) 5 times. They keep on returning the same unit to me saying it has been repaired and checked. Last 'repair job' took over 2 and a half months and they promised me a different unit. Just picked it up now and it still has exactly the same fault, and it is still my original phone. I of course have had to pay my monthly subscription although it has spent more time in their work shop than in my pocket. It doesn't matter who i speak to - they are full of empty promises. They really don't care about their customers at all I have been a loyal customer since the start of Mtn, but no more! Mtn must fall!