WORST CUSTOMER SERVICE EVER!!!

I purchased airtime through their online service on Sunday 2 August . I never received the voucher. I contacted the customer service line the following Tuesday and was told the system was offline but I would receive my voucher as soon as the system was online. That never happened. I phoned again only to hold the line for almost 20 minutes without getting assistance. I sent their customer services an email and no one bothered to respond until today. I even contacted them through facebook and they seem useless. All I am interested in now is that my account gets credited with what I was charged for something I never received. Unfortunately this is not the first time I experience such poor customer service from them either. I am deeply disappointed in their lack of interest in responding to and resolving customer queries.