SAMSUNG BUY AND GET ***** AND ****

I purchased my Samsung fridge and dishwasher on the Buy and Get promotion where i received 2 x R4000 vouchers. After going through the whole terrible process of getting the vouchers codes to use them only 1 of them worked and the other said it had expired when using them on the exact same day. I phoned in and discussed this with the consultant who had confirmed that there was a definite problem and it would need to be escalated. After 2 weeks of waiting for a reply to the escalation I received a call from the Samsung warranty repair center at which it all turned out to be a incorrect escalation by the consultant to the wrong department. I phoned the Buy and Get number again and explained the issue to the on hand manager. He went off to do his research and would call me back. Once the manager phoned me back he said that my voucher is active and has been since 2018 which is very wrong, I told him I've had the voucher codes for 1 week. I explained everything once again and that the voucher code shows expired. I asked the manager for a new code to be sent to me and 2 extra weeks in order to use the code, for the time wasted and for the inconvenience that they have put me through. He argued and said NO he wont do that and that I have 2 days to use it at which the place I wanted to use the voucher had no space available anymore. Never mind the fact that the initial consultant said ill be given all the days lost to use the voucher. Now I am sitting with an expired voucher once again, Ive lost a R4000 voucher and I am not able to make any bookings due to the incompetence of the staff members and Samsung itself. I want to know how this issue is going to be resolved. This whole buy and get thing is a real disaster, with staff members and managers not trained correctly in procedures and communication. I await your response.