washing machine promoR500 not received.ongoing2yrs

i am fed up of calling samsung callcentre and speaking to *********** teamleaders who promise to investigate and then dont and later im told re-signed. i purchased a washing machine from game northgate with a promo that they will give you a R500 voucher if you trade in your old washing machine with a purchase of a new one and get omo auto free. they delivered the new w/machine and collected the old w/machine and furnished me with a debit card which was never loaded with the R500. i have been calling for over 2years and this is not resolved. i want my R500. this is misleading and the debit card is expiring jan 2016. I ahve been very patient and kept giving chances, last call was promised that sebastians manager , gareth will come back to me.since last call, he is also no longer in your employ. what a joke, you are *******,