Accused for *****ing at box by the security and management

Upleseant customer service I received from Boxer Management and security I was busy doing my shopping at boxer supper sto in park central and I was approached by a security officer while I was drinking a 500ml prite that I was going to pay for I he told me that I was not allowed to drink while I'm in the store I apologize and asked for the indemnity notice e told me to go look by the fridges I went but there was no sign I went to the manager Lebogang and asked if there's any note that says we are not allowed to drink while in the shop he said yes but people do remove it I'm very disappointed and embarrassed by the way I was treated as if was *****ing and I don't normal buy a groceries that costs less than R600 I would not mind if that was the rule of the sho that says drinking inside the shop it's not allowed I have a proof that I spent more than R1500 in box but I was just embarrassed for a mere cold drink that cost R11