BAD CUSTOMER SERVICE

I am unhappy about the manner in which a problem I presented to Vodacom Customer Service is being handled. Last year I took out a data contract online. The usb modem, sim card and a promotional Topdog voucher was delivered at my work during November 2015. For some unfortunate I misplaced the unused voucher and after days of looking around for it I eventually gave up and approached Vodacom for a re-issue of the voucher. I made this request through email and two days later I received a call from Customer Service who inter alia indicated that I shall receive call from the dedicated department. To date I have not been assisted. The last email I received told me to call Direct Sales. However this is wrong in that I have been promised that I will be called. All I request is the re-issue of a new voucher in that I have lost the other one unused. I still have the product code that will enable Vodacom to trace if indeed it has been used or not.