MTN LOYAL CLIENT FOR 17 YEARS - NO TREATING CUSTOMER FAIRLY FOR THIS COMPANY

I've been battling with MTN since 28th of September. They deducted more that R2000 per month for the past 3 months - double charging me on itemised billing, data "on net minutes" and R55 per month for a blackberry service I had 6 years ago. Reference numbers 1- ********** 0471, ********** 0 - I worked out the refund amount should be at least R1400 - their repayment R36.00, but my blackberry charge alone is R45.39?????? Then sounding like a TV add - BUT WAIT there is more. My son's sony (on 2year contract for R549 that is now charged at more than a R1000 per month broke last night half way though the contract. I went into the MTN at Tygervalley, where an very unhelpful staff member inform me MTN do not repair Sony - would help if they told this to you when you upgrade? Phoning Sony there is a collection fee of R170 + additional cost just to get a quote? So maybe next time inform the client there is no after service for SONY? I have send various mails to customer care with no feedback of the refund and only a SMS stating the matter is resolved??? I will cancel 2 of the 4 phones this month still - the other 2 unfortunately I have to pay until end of July next year. THEN MTN I AM DONE WITH YOUR EXPENSIVE DATA, EVEN WORST (NON)SERVICE. WELL DONE ON TREATING YOUR CUSTOMER FAIRLY - not a compliment!