waiting for refund of overcharge for 3 months

On February 13, 2015 I flew from Johannesburg to Cape Town. At 4 or 5 am I checked in my baggage. My hand baggage (a fragile sewing machine) was checked in as a main baggage what made my baggage overweight. I pre-booked extra 5kg before the flight just in case. On the day of the flight I had 34kg of baggage and not 20 allowed but I had a voucher for extra 5kg. That voucher was ignored by the lady in Mango help desk and I was charged for 14kg instead 9kg what makes Mango ove me R225. When I collected my FRAGILE sewing machine in Cape Town it was cracked in few places and even thou marked with a sticker as fragile it wasnt handled with care. I called their call center but they just gave me an e-mail to deal with. So on 19 February I emailed with explanations just to receive a reply 5 days later that my case will be looked into. on 23 March I emailed them again to find out when I can get my money back, on the same day I got email back saying that my case will be resend to IT department and again...No more messages from [Email Removed] ...unprofessional, ridiculously late and very bad customer service at Mango.