Mtn spring special September

I've upgraded in September on my cellnr and took the A50 Samsung with the offer of a R750 takelot voucher. We've send the phone's IMEI number to the number given in the cataloque but haven't receive any voucher yet. When I phone the lady at Mtn Flamwood in Klerksdorp she told me that I must send an email to *** which I did but there isn't such email address. The other lady told me they haven't time to read through the cataloque to see what I must do to receive my voucher. I still want my voucher!!!! This is very poor customer service.