Useless and pathetic mango airlines

Mango is just pathetic when it comes to customer service. It really frustrates me that the sense of customer service or rather the lack of customer service upsets me. On 01/08/2018 i made a booking then realised i selected the wrong week. I called the call centre and was informed that i could change the date without the charge. I then called back with the correct date and times and procedeed to book. The agent then told me rather make the changes online. Which i did. However my flights were double the cost! And i was charged to change my flight. Flights that had cost me R2875 now cost me R7751. And nobody seems to care. Iv called so many times spoken to princess. Patience. Cindy. An agent that was even meant to hear my recording and call me back on friday never did. I contacted mango via Twitter they promised to get back to me today. Still no contact has been made! I dind this ridiculous! I want a refund i cant handle this anymore mango is just useless if you dont value me as a client why should i value you! O wait. You wont contact me. And if i dont board the flight its my loss of 7k. You probably wont understand the seriousness of this nor will you do anything about it