Call dropped by call centre agent and no return ca

I telephoned Cell C today to enquire about the Smartcall debits for R6.15 , amounting to a total of R172.20 for my Invoice dated 1 March 2016 and spoke to Iyanda.<br> <br> She dropped my call and didn't bother to try and call me again despite the fact that I had given her my contact details and query info.<br> <br> I find this absolutely disgusting and unprofessional.<br> <br> I have WhatsApp bundle for R5 per month and only use this apart from an sms or phonecall or tow. So I don't understand why Cell C are so costly.<br> <br> Please advise what all the smartcall charges are!!