Communications of promotional offerings

I received the R5000 flight center voucher with my upgrade on the Samsung S8 as well as the "R250 off" genuine Samsung accessories voucher. Up to date Vodacom has been unable to provide me with a location as to where I can use the discount voucher. I have spent more money on fuel driving to different stores only to hear that they do not accept the voucher. I have also received no communication regarding the flight center voucher, I had to phone in, only to hear that the details I submitted were not satisfactory and I now again have to wait another 10 working days, after waiting 10 days already. There are no instructions on the website as to how to submit the correct details the first time. I wanted to use this voucher over my December break, now I wont be able since I will only receive feedback next year. Vodacoms only excuse is, "I'm sorry sir". This is extremely poor service