Competition is a farce

I recently purchased 3 cases of Millers genuine draft 660ml as they came with a competition which gave you R10 airtime for every two bottle cap codes texted to a given specified number . After many tries, I kept getting \Invalid code\", and after trying several times daily it would then say \"maximum number of invalid codes entered for the day\". The first time I entered a code it said the competition closing date had been extended to later in April, despite the cardboard coupon saying closing date 3 April 2016. I am now very frustrated as not only does the competition appear to have ended, I have 36 bottle caps in my possession (worth R180 in airtime) which appear now to be worthless - and I have received absolutely no free airtime. If this is the way SAB conduct competitions then perhaps it is time to change my brand. "