Coffee Special Disaster

I was in my Local Pick n Pay store today in George when I saw their Nescafe Coffee was on special to coffee club members. I did as the advertised poster said and SMS'd my smart shopper number to the number provided. I got to the till with my 6 bottles of Nescafe Espresso coffee as it was a great special, however the discount was not app**** to my bill. I questioned it and said the coffee was on a promotion. First I was told no the coffee was not on special, I then said yes it was and showed them a picture of the special as I had sent it to my family group as it was a great special. They then told me that I was not a coffee club member, I showed then the Welcome sms and that I was a member. I was then told it takes up to 72hours for my coffee club membership to be approved and activated. During this time I was told there is no other way but that I pay full price for my coffee. I then asked them where on the branding it says anything along the lines of waiting 72 hours to become a member of this coffee club, the branding simply states send your smart shopper number to a given number and you qualify for the discount. It mentions nothing regarding a 72 hour waiting period. The manager gave me attitude and sighed saying im holding up a que and that i either pay full price for the coffee or they remove the coffee from my purchases. This is the second time that I have walked out of this exactly Pick n Pay in the last 2 weeks due to this exact reason and bad service.