Very bad service from Vodacom

I was given the Expired voucher by Vodacom when I purchased a laptop and I only noticed when I tried to redeem itThe Also **** that I will buy anywhere with it,Only to find out that I will get R500 discounts when I buy a laptop or printer but I already bought laptop.And they didn't upgrade my laptop to my previous phone as promised they only added new contacts that makes me to pay more money to then