coke 300ml glass bottle. Be careful

Coca cola have a 300ml glass bottle introduced. The cost is R5 plus a deposit of R3. When I returned the bottle the store where I bought it from refused to refund saying he wants to see the slip when purchased. I contacted coke south Africa and they said they cannot do anything about it. This store never gives a slip when purchasing. So don't be sure to get your deposit back. Coke does not assist in any way