Lack of communication

Dischem Newmarket Mall. They advertised Blue Diamond Almond Milk on special offer last weekend, ending on Sunday. Went to the store 3 times...no stock on their shelves. Then paid for 3 units and they took my contact details and proof of payment with promise to contact me as soon as stock arrives. A week later .....no word from them. Now it will be 4th trip to them. Disgusted client