Woolworths not catering for diabetics

The Woolworth in the Gift acres in Lynnwood Ridge does not cater for people that can't consume sugar products. The last two months this store did not stock any coke products and when you ask the manager why he only said they forgot to place an order. they finally received stock but no sugar free drinks when you ask the staff there they said that they are no longer going to stock them and only the Woolworth brand are available. as a pre-diabetic i cant drink cold drinks that has sugar this store is the only store in the mall that sells healthy food. I tried to speak to the manager but he could not tell me why they don't have stock