Game Reds Mall don`t issue call backs then refuse to sell to customers

Hi I wanted to buy some 410g Koo Beans which was on special R34 for 4 but when i went to Reds Mall they were out of stock but the special was still on.So i was advised by the supervisor to subscribe for a call back sms which i did.I received an s.m.s nofiying me that stock had been delivered.So when i went to buy on 11-03-2019 i was then told i could only buy 4 tins .The supervisor went on about too many reversals and he should have ordered from other branches.... So here is my question to Game,why do you put items on special then refuse the customers to buy?Its not the first time at game Reds Mall the other time the supervisor told me that Game is not Makro ,if you want to buy more go there. That is not good for business chasing customers away.