DOUBLE charged, baggage not handled correctly!

Went on a flight to Johannesburg a month ago. Mango site was not working, had to call centre and they then proceed to charge me R700 to change flight details (on website it states this change would cost R280). Noticing this I told the consultant who guaranteed money would be paid back into account. A month later and emails sent to Mango (the address on the sight seems invalid?) and still no response and no money. Furthermore I also booked luggage into fragile, paid extra and this was just thrown in with all the other luggage. I am so disappointed in this service, lack of response and poor standards being kept. I want my money back for both the flight being overcharged and my baggage which was not even put into the fragile section!! What a mess!! Utterly disappointed!! I feel I have given them more than enough time to respond and make this right, now is time for action.