Samsung buy and get ****

I bought samsung products in 2016 with the vouchers that expires on the 31st July 2018.when trying to book it on line it never goes through. I then phoned Protea hotel head office which informed me that you can book months in advance you need to book exactly 28 days in advance on the day that you need to arrive at the hotel. Samsung email me the code that expires 30th June 2018 which is a month before the expiring date of 31st July 2018 , When I want to make my booking on the 3rd of July 2018 the voucher expired. When I call Samsung I spoke to Wasiela and said I took upon myself to phone and they cant give me a voucher till the end of July cuase I took to long to use it. Although I explained to her that Protea hotel doesn't take bookings in advance she was adamant that it's my own fault for not use it and waited so long to be use so they want give my another voucher till the end of July 2018...