Mango Staff does not assist in anyway

Dear Mango I confirmed my booking and was assisted by Mashiya Mgojo on the 20th August 2015 on Saturday the 29th August 2015 I sent an email to Mashiya requesting the booking to be cancelled in order to get a 6 months voucher because my trip was cancelled. Today is the 1st of September 2015 I stil havent received a responce for assistance. On Sunday the 30th August 2015 I sent an email to enquiries asking for assistance, till today I havent been assisted. I called your number *** and your agents are for ever busy. this is extremely frustrating and unprofessional. Why is it such a mission for your staff to do their job. You cant be busy from last week Thursday to respond to a Customer.