Useless Call Centre Agents - cant answer general queries

Your call centre is useless they cant answer if their system is able to assist with an invoice showing air fare amount before voucher used to zero the amount, the agent then says I was charged R1200 and i have to explain again, and point out thats the levy and charges amount not the fare amount which i needed to point out, then i state the agent obviously didnt understand my question and the phone just goes silent, (utterly useless service, serious training and customer service needed, as per your Hello Peter rating of 1.2) the call before this the agent just played music in my ear after i gave the reference number and made me wait 15 minutes so i hung up.