Pathetic service!!!!!

I went into the store looking for some pants for my boy, saw the 30% when you buy two deal got those went to the tellers. I get told I had to take same brand which is not being mentioned on the stickers, but I do that nonetheless. When I got to the tellers again it still doesn't deduct then I asked them what? Without any care they tell me it doesn't deduct system is down and there's nothing we can do. How can a company as big as National Brands employ people who doesn't know what to do when they have a system glitch? Is it because they don't care about customers or they only there to collect a paycheck and don't care how customers gets affected. As if that isn't enough I ask them to keep the items for me because I really need the pants for my child and they had limited sizes of size 2 to 3 they tell me they can only keep those items for 24hrs, first of all I took my time going to the store I could have went to any store but I wanted Truworths items, secondly I wasted my petrol for a trip that never fulfilled my desire, thirdly how is it my problem that there is a system glitch and I had to be inconvenienced because they don't give a sh*t about their customers. And now I have to travel again for the same thing at an extra cost, when I asked what happens if the system doesn't apply the discount I get told they will extend the time. So like an idiot I'm expected to just go to the store daily like I have nothing better to do other than look at people who can't solve a problem or do a bare minimum of what they getting paid to do. Wow!!!! That it's a pathetic service at its best.